These M&M holiday blondies are a simple, festive treat to bake this season. Baked in an 8×8 pan, they yield chewy, fudgy bars studded with colorful M&M’s and chocolate chips—one of my family’s favorite desserts.
This is the best Christmas M&M cookie bar recipe ever!
These blondies are dense, fudgy, and packed with holiday M&M’s and chocolate chips. They’re perfect for cookie exchanges, holiday parties, or a cozy baking project with kids. Try them and leave a note if you do!
Why you should make these holiday blondies
- Simple ingredients and an easy, one-bowl method.
- Great for holiday parties or cookie exchanges.
- Fun to bake with children.
- Soft, fudgy texture—just how a blondie should be.
- Minimal cleanup thanks to the one-bowl approach.
Ingredients for these delicious M&M cookie bars
Below are the ingredients needed for this holiday blondie. See the recipe card for exact measurements and full instructions.
- Butter (salted or unsalted)
- Light brown sugar (no granulated sugar for extra fudginess)
- Egg and an egg yolk
- Vanilla extract
- All-purpose flour
- Salt
- Christmas M&M’s (regular or mini)
- Mini chocolate chips (optional)
How to make these Christmas cookie bars
Follow these summarized steps, then scroll to the recipe card for exact times and measurements.
- Cream butter and brown sugar until combined.
- Add the egg, egg yolk, and vanilla; beat until light and slightly fluffy to encourage a crinkly top.
- Fold in flour and salt just until incorporated—don’t overmix.
- Stir in M&M’s and chocolate chips, then spread the batter into a parchment-lined 8×8 pan.
- Bake until set, then cool completely before slicing into squares. Serve with a glass of cold milk if you like.
M&M cookie bar variations
- Use different colored M&M’s for other holidays and events.
- Swap chocolate chips for peanut butter or white chocolate chips.
- Add chopped nuts for extra texture.
- Use peanut M&M’s for a different flavor profile.
Frequently asked questions – FAQ
How to store these M&M bars?
Store in an airtight container at room temperature for up to 4–5 days. Warm briefly in the microwave for a few seconds to soften before serving.
Can I freeze these M&M Christmas blondies?
Yes. Freeze in an airtight container or freezer bag for up to 2–3 months. Thaw overnight in the fridge or a few hours at room temperature. Reheat briefly in the microwave to refresh the gooey texture.
Christmas M&M blondies recipe / Holiday blondies
Holiday M&M blondies
Equipment
Ingredients
- 1/2 cup butter softened
- 1 cup brown sugar
- 1 large egg
- 1 egg yolk
- 2 tsp vanilla extract
- 1 1/2 cup all-purpose flour
- 1 tsp salt
- 3/4 cup Christmas M&M’s regular or mini, plus extra for topping (optional)
- 1/2 cup chocolate chips optional
Instructions
- Preheat the oven to 350°F and line an 8×8-inch baking pan with parchment paper.
- Cream the butter and brown sugar together on medium speed until combined.
- Add the egg, egg yolk, and vanilla. Beat for at least 3 minutes to encourage a crinkly top.
- Fold in the flour and salt until just combined; avoid overmixing. Stir in the chocolate chips and M&M’s.
- Spread the batter into the prepared pan and bake for about 17–20 minutes, until set at the edges but still slightly soft in the center.
- Remove from the oven and cool completely (about 1–2 hours depending on kitchen temperature). Once at room temperature, slice into 16 squares and enjoy.
Notes
Storage guidelines:
- Up to 5 days in an airtight container at room temperature.
- About 1 week refrigerated in an airtight container.
- Up to 2–3 months frozen in an airtight container.
Nutrition
Nutrition information is automatically calculated and should be considered an estimate.
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