There is just something about green frosting and Lucky Charms marshmallows that instantly makes it feel like St. Patrick’s Day in the best way.
These St. Patrick’s Day Lucky Charms Brownies are the ultimate shortcut holiday dessert. We’re taking a simple boxed brownie mix, topping it with bright green buttercream, and finishing it off with those colorful Lucky Charms marshmallows everyone secretly picks out of the cereal anyway.
They’re festive. They’re fudgy. They’re kid-approved. And mama… they’re EASY.
This is the kind of St. Patrick’s Day recipe that looks like you planned ahead for weeks — but really took you about 15 minutes of hands-on time.
Total Crazy Busy Mama win.
Ingredients for St. Patrick’s Day Lucky Charms Brownies
How to make St. Patrick’s Day Lucky Charms Brownies: ingredients you need!
You only need a few simple ingredients:
1 box brownie mix (plus ingredients listed on the box: eggs, oil, water)
1 container buttercream frosting
Green food coloring (about 5 drops, or until desired shade)
Lucky Charms marshmallows (picked out from the cereal)
Simple. Affordable. Festive.
St. Patrick’s Day Lucky Charms Brownies Video Tutorial
For those of you who would love a visual step-by-step tutorial here is one for you!
How to Make St. Patrick’s Day Lucky Charms Brownies
How to make St. Patrick’s Day Lucky Charms Brownies : a step by step guide
Bake the Brownies
Prepare and bake the brownies according to the directions on the box.
Let them cool completely before moving on to frosting. This is important — warm brownies will melt the frosting.
Make the Green Frosting
In a small bowl, mix the buttercream frosting with green food coloring.
Start with a few drops and stir well. Add more if needed until you reach your perfect shamrock green.
Frost the Brownies
Spread the green buttercream evenly over the cooled brownies.
You can smooth it flat or create soft swirls with a spatula for texture.
Add the Lucky Charms
Sprinkle Lucky Charms marshmallows generously over the frosting.
The more colorful, the better. This is where the St. Patrick’s Day magic really happens.
Slice & Serve
Cut into squares and serve.
Perfect for:
Or just a fun Friday night surprise
Classroom parties
Church gatherings
After-school treats
St. Patrick’s Day dessert tables
St. Patrick’s Day Lucky Charms Brownies: SIDE IDEA
Pair these with Lucky Charm Cookies for the ultimate St. Patrick’s Day dessert spread.
The soft, chewy cookies balance perfectly with the rich, fudgy brownies. And when you serve them together, your table looks colorful, cohesive, and completely festive without requiring complicated recipes.
Brownies + cookies = guaranteed crowd-pleaser.
Crazy Busy Mama Tip
Pick out the Lucky Charms marshmallows before you start baking.
Let your kids help — they’ll love being “in charge” of separating the marshmallows. It makes them feel involved, and it saves you from digging through cereal at the last minute.
For cleaner slices, refrigerate the frosted brownies for 20–30 minutes before cutting.
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Mama, If you give this recipe a try and love it, I’d be thrilled if you could leave a comment and a 5-star rating below! Your feedback not only makes my day but also helps me understand what kinds of recipes you'd like to see more of.
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More Easy St. Patrick’s Day Recipes
If you love this St. Patrick’s Day Lucky Charms Brownies, be sure to check out these other easy St. Patrick’s Day recipes that will add fun and flavor to every meal.
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St. Patrick’s Day Lucky Charms Brownies
Ingredients
- 1 box brownie mix
- 1 tub buttercream frosting
- green food coloring
- lucky charms marshmallows
Instructions
Prepare and bake brownies according to package instructions.
Allow brownies to cool completely.
Mix buttercream frosting with green food coloring until desired shade is reached.
Spread green frosting evenly over cooled brownies.
Sprinkle Lucky Charms marshmallows on top.
Slice into squares and serve.
Notes
- Let brownies cool fully before frosting.
- Chill before slicing for clean edges.
- Store covered at room temperature for up to 3 days.
- For extra texture, sprinkle crushed cereal pieces on top.
Nutrition
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