The other day, I saw a box of Lucky Charms at the grocery store, and a wave of childhood memories washed over me. I remember saving the marshmallows for the last spoonful, a little treasure at the end of my morning meal. That feeling of simple joy is what inspired these Crumbl frosted Lucky charms cookies. I wanted to capture that magical taste in a soft, chewy cookie that feels both nostalgic and wonderfully new. It’s more than just a sweet treat; it’s a bite of happiness that reminds me of Saturday morning cartoons and carefree days. Making these cookies brings that same fun right back into my kitchen, and this recipe makes it so easy to share. We all remember those fun breakfast cereals, and these Crumbl frosted Lucky charms cookies are the perfect dessert version.
This recipe for Crumbl frosted Lucky charms cookies is designed for anyone to make. You don’t need to be a professional baker to create these amazing treats. The soft cookie base, loaded with crushed cereal, and the creamy marshmallow frosting come together perfectly. This is the ultimate treat for St. Patrick’s Day or any day you need a little extra luck.
Why You’ll Love These Frosted Lucky Charms Cookies
There are so many reasons to adore this recipe, but the best part is the incredible texture and flavor combination. These aren’t your average sugar cookies. They have a distinct softness that practically melts in your mouth, a signature of the Crumbl style we all love. Furthermore, the flavor is straight out of a storybook.
The secret is incorporating the cereal in two ways. First, we mix crushed cereal pieces directly into the dough, which gives every bite a hint of that familiar oat flavor. Then, we top the cookies with a generous swirl of marshmallow frosting and a sprinkle of those iconic colorful marshmallows. The result is a fun, vibrant dessert that is both visually appealing and incredibly delicious. These Crumbl frosted Lucky charms cookies are perfect for parties, bake sales, or simply as a special afternoon snack.
The Magic is in the Texture
Achieving that perfectly soft, chewy cookie is easier than you think. The key lies in a few specific techniques. First, using a combination of butter and shortening gives the cookies a tender crumb that stays soft for days. Also, be careful not to overmix the dough once you add the flour. Mixing just until the ingredients are combined prevents the gluten from developing too much, which would result in a tougher cookie.
Another important step is slightly underbaking the cookies. You want to pull them from the oven when the edges are just set and the centers still look a little soft. They will continue to cook on the hot baking sheet for a few minutes after you take them out. This method is the best way to get that chewy, gooey center that makes these Crumbl frosted Lucky charms cookies so irresistible.
Getting the Ingredients Right for Crumbl Cookies
A great cookie starts with quality ingredients. For this recipe, the star is obviously the Lucky Charms cereal. You will need to separate the oat cereal from the marshmallows for use in different parts of the recipe. While it takes a few minutes, it’s a simple task that the kids will love to help with.
For the cookie dough itself, we use standard pantry staples like all-purpose flour, granulated sugar, and brown sugar. The brown sugar adds moisture and a slight caramel note that complements the cereal. A touch of cornstarch is my secret weapon for extra softness. It makes the dough more tender and prevents the cookies from spreading too much while baking. For the frosting, butter, powdered sugar, and marshmallow fluff create a creamy, sweet topping that tastes just like the best part of the cereal.
Let’s Talk About That Marshmallow Frosting
The frosting is what truly makes these cookies special. It’s a simple buttercream base made with softened butter and powdered sugar, but the addition of marshmallow fluff transforms it into something magical. The fluff gives it a light, airy texture and a distinct marshmallow flavor that is absolutely perfect.
When making the frosting, be sure your butter is at room temperature. This helps it whip up smoothly without any lumps. You can add a splash of milk or heavy cream if the frosting seems too thick, or a bit more powdered sugar if it’s too thin. Spread it generously on the cooled cookies, then top with the reserved Lucky Charms marshmallows for that final, colorful touch.

Our Copycat Crumbl Lucky Charms Cookie Recipe Process
This Copycat Crumbl Lucky Charms cookie recipe is designed to be straightforward. The entire process can be broken down into three main stages: making the dough, baking the cookies, and frosting them. Each step is simple, and you’ll find the flow easy to follow, even if you’re new to baking.
The first part of any baking adventure is gathering and preparing your ingredients. This is a practice professionals call “mise en place,” and it makes everything go smoother. Measure your flour, separate your cereal, and let your butter soften on the counter. Taking a few moments to organize before you start means you won’t be scrambling for an ingredient mid-mix. This structured approach is a cornerstone of baking any good cookie.
Mixing and Chilling the Dough
Once your ingredients are ready, you’ll cream the butter, shortening, and sugars together until they are light and fluffy. This step incorporates air into the dough, which contributes to the soft texture. Next, you’ll beat in the egg and vanilla extract. Finally, you’ll gently mix in the dry ingredients and the crushed oat cereal.
Chilling the dough is a highly recommended step in this Copycat Crumbl Lucky Charms cookie recipe. While you can bake them right away, chilling the dough for at least 30 minutes helps the flavors meld together and, more importantly, prevents the cookies from spreading too much in the oven. This gives you thicker, chewier cookies. Simply cover the bowl with plastic wrap and pop it in the refrigerator.
Baking and Cooling Your Cookies
Proper baking is crucial for achieving that signature Crumbl texture. You’ll want to use a cookie scoop to create large, uniform dough balls. This not only makes the cookies look professional but also helps them bake evenly. Place them on a parchment-lined baking sheet, leaving plenty of space between each one.
Bake them just until the edges are lightly golden but the centers are still soft. Remember, they will set up as they cool. Let the cookies rest on the baking sheet for about 5-10 minutes before moving them to a wire rack to cool completely. It’s very important that the cookies are fully cool before you attempt to frost them. If they are even slightly warm, the frosting will melt and slide right off.
Pro Tips for the Best Results
To get bakery-quality cookies every time, pay attention to the details. First, measure your flour correctly. Instead of scooping directly from the bag, which can pack the flour down, spoon it into your measuring cup and level it off with a knife. This prevents you from using too much flour, which can make the cookies dry.
Another tip is to use room temperature ingredients, especially the egg and butter. They combine more easily and create a smoother, more uniform dough. Finally, don’t skimp on the vanilla extract. A good quality pure vanilla extract adds a depth of flavor that complements the sweet cereal and frosting perfectly. Following these simple suggestions will make your Crumbl frosted Lucky charms cookies taste even better.

Full Recipe: Crumbl Frosted Lucky Charms Cookies
Prep Time: 20 minutes
Cook Time: 12 minutes
Chill Time: 30 minutes
Total Time: 1 hour 2 minutes
Servings: 12 large cookies
Calories: Approximately 350 kcal per cookie
Ingredients:
For the Cookies:
- 1/2 cup (113g) unsalted butter, softened
- 1/4 cup (48g) vegetable shortening
- 3/4 cup (150g) granulated sugar
- 1/4 cup (50g) packed light brown sugar
- 1 large egg, room temperature
- 2 teaspoons pure vanilla extract
- 2 cups (240g) all-purpose flour
- 1 tablespoon cornstarch
- 1/2 teaspoon baking soda
- 1/4 teaspoon salt
- 1 cup Lucky Charms cereal, oats and marshmallows separated (oats crushed)
For the Marshmallow Frosting:
- 1/2 cup (113g) unsalted butter, softened
- 2 cups (240g) powdered sugar
- 1/2 cup (43g) marshmallow fluff
- 1-2 tablespoons milk or heavy cream
- 1/2 teaspoon vanilla extract
- Reserved Lucky Charms marshmallows for topping
Instructions:
1. Prepare the Dough: In a large mixing bowl, use an electric mixer to cream together the softened butter, shortening, granulated sugar, and brown sugar until light and fluffy, about 2-3 minutes. Add the egg and vanilla extract, and beat until just combined.
2. Combine Dry Ingredients: In a separate bowl, whisk together the flour, cornstarch, baking soda, and salt. Gradually add the dry ingredients to the wet ingredients, mixing on low speed until just combined. Be careful not to overmix. Gently fold in the crushed Lucky Charms oat cereal.
3. Chill the Dough: Cover the bowl with plastic wrap and refrigerate for at least 30 minutes. This step is important for preventing the cookies from spreading too much.
4. Bake the Cookies: Preheat your oven to 350°F (175°C). Line a baking sheet with parchment paper. Scoop large, 3-tablespoon-sized balls of dough and place them 2-3 inches apart on the prepared sheet.
5. Bake: Bake for 10-12 minutes, or until the edges are set and lightly golden, but the centers still appear soft. Let the cookies cool on the baking sheet for 5-10 minutes before transferring them to a wire rack to cool completely.
6. Make the Frosting: While the cookies cool, prepare the frosting. In a mixing bowl, beat the softened butter until creamy. Gradually add the powdered sugar and beat until smooth. Mix in the marshmallow fluff and vanilla extract. Add milk or cream, one tablespoon at a time, until you reach your desired consistency.
7. Frost and Decorate: Once the cookies are completely cool, spread a generous layer of marshmallow frosting on top of each one. Sprinkle the reserved Lucky Charms marshmallows over the frosting.
Chef’s Notes:
- For a perfectly round cookie shape, use a large glass to swirl around the hot cookie right after it comes out of the oven.
- Store the cookies in an airtight container at room temperature for up to 3 days.
- You can make the dough ahead of time and refrigerate it for up to 48 hours before baking.
Frequently Asked Questions
Can I make the dough ahead of time?
Yes, absolutely. The cookie dough can be made and stored in an airtight container in the refrigerator for up to two days. You can also freeze the dough balls for up to three months. When you’re ready to bake, just place the frozen dough balls on a baking sheet and add a few extra minutes to the baking time.
What makes these cookies so soft?
The combination of butter and shortening, along with a touch of cornstarch, is the secret to their incredibly soft texture. The shortening helps the cookies hold their shape and provides a tender crumb, while the cornstarch keeps them soft and prevents them from becoming crisp. Slightly underbaking them also contributes to a chewy, soft center.
How do I store leftover Crumbl frosted Lucky charms cookies?
Store any leftover cookies in a single layer in an airtight container at room temperature. They will stay fresh and soft for up to three days. If you stack them, the frosting might get squished, so it’s best to keep them in one layer or place a sheet of wax paper between layers.
Do I need to chill the cookie dough?
Chilling the dough is highly recommended for this recipe. It solidifies the fat in the dough, which prevents the cookies from spreading too thin during baking. This results in thicker, chewier cookies. A minimum of 30 minutes in the refrigerator makes a significant difference.
Conclusion
Baking a batch of these Crumbl frosted Lucky charms cookies is more than just making a dessert; it’s about creating a moment of pure fun. From separating the colorful marshmallows to spreading the sweet, fluffy frosting, every step is a joy. This Copycat Crumbl Lucky Charms cookie recipe brings the magic of a favorite childhood cereal into a warm, soft-baked treat that everyone in the family will love. So preheat your oven, grab that box of cereal, and get ready to bake some happiness.




