Festive M&M Cookie Bars: A Sweet Solution for Leftover Egg Yolks
Is there anything more festive than a tray of freshly baked M&M cookie bars? Today, I’m sharing a truly special recipe that’s not only irresistibly delicious and moist but also a brilliant way to use up six leftover egg yolks from all that holiday baking. Whether you’re planning a cozy afternoon treat or whipping up something cheerful for a Christmas party, these cookie bars are here to save the day!
Are you curious about how to make the most of those extra M&Ms—or wondering what to do with your leftover egg whites?
These versatile cookie bars can be tailored to your holiday mood! Use red and green M&Ms for a classic Christmas vibe, or let your inner artist shine with a rainbow of colors. And if you’ve got more M&Ms than you know what to do with, why not bake a batch of M&M cookies too? Trust me, they’re just as easy and delicious as these bars.
Oh, and those extra egg whites? Waste not, want not! Turn them into a luscious 6-egg white chocolate cake or a batch of Grandma’s famous coconut macaroons. Both are perfect additions to your holiday dessert table and a great way to keep the season merry and bright—while reducing food waste at the same time.
So, let’s dive in and bake up some holiday magic! And if you’re on the hunt for even more creative ways to use up egg yolks or whites, keep reading—I’ve got you covered with plenty of ideas below.
🥘 Ingredients
- Egg yolks
- Unsalted butter, melted and slightly cooled
- Brown sugar - I opted for Demerara Sugar
- Granulated sugar
- Vanilla extract
- All-purpose flour
- Baking powder
- Salt
- M&M’s - Red and green or rainbow colored
See the recipe card for quantities.
🔪 Instructions
Preheat Oven
Preheat your oven to 350°F (175°C). Line a 9x13-inch (23x33 cm) baking pan with parchment paper, leaving an overhang for easy removal.
Mix Wet Ingredients
In a large mixing bowl, whisk together the melted butter, brown sugar, and granulated sugar until smooth. Add the egg yolks and vanilla extract, whisking until fully combined.
Combine Dry Ingredients
In a separate bowl, whisk together the flour, baking powder, and salt.
Form the Dough
Gradually add the dry ingredients to the wet mixture, stirring just until combined. Gently fold in the M&M’s.
Spread in Pan
Pour the batter into the prepared baking pan and spread it evenly with a spatula. Scatter a few extra M&M’s on top for decoration.
Bake
Bake for 30-45 minutes, or until the edges are golden and a toothpick inserted in the center comes out with a few moist crumbs. Do not overbake to keep the bars chewy.
Cool and Slice
Let the bars cool completely in the pan, then lift them out using the parchment overhang. Slice into squares or rectangles.
🍽 Equipment
- 9x13-inch (23x33 cm) pan
- Parchment paper
- Hand or Stand mixer
- Mixing bowls
- Spatula
- Sharp knife
💭 Top tips
- Add-ins: You can mix in chopped nuts or chocolate chips alongside the M&M’s for extra texture.
- Storing: Store the bars in an airtight container at room temperature for up to 5 days.
- Pan size: You'll need a 9x13-inch (23x33 cm) pan. This size is perfect for achieving a nice balance between the thickness and chewiness of the bars. If you use a smaller pan, the bars will be thicker and may require a longer baking time. Conversely, a larger pan will make thinner bars that bake faster.
🥚 Other Egg Yolk & Egg White Recipes for You to Try
- Egg Yolk Cookies with Jam
- Egg Yolk Bundt Cake
- Walnut Cookies
- Homemade Advocaat / Egg Liqueur
- Linzer Cookies with Egg Liqueur Ganache
- Sour Cream Cookies
- Vanilla Sauce
- Vanilla Ice Cream
- 6 Egg White Chocolate Cake
- Coconut Meringue Cookies {Granny's Recipe}
- Cranberry Whiskey Sour
- Clover Club
- Hazelnut Meringue cookies
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📖 Recipe
6 Egg Yolk M&M Cookie Bars
Equipment
- 9x13-inch (23x33 cm) pan
- Hand or stand mixer
- Sharp knife
Ingredients
- 1 cup Unsalted butter, melted and slightly cooled
- 1 cup Brown sugar
- ½ cup Granulated sugar
- 6 egg yolks
- 1 teaspoon Vanilla extract
- 2 cups All-purpose flour
- 1 teaspoon Baking powder
- ½ teaspoon Salt
- 1 cup M&M’s (plus a few extra for topping)
Instructions
- Preheat your oven to 350°F (175°C). Line a 9x13-inch (23x33 cm) baking pan with parchment paper, leaving an overhang for easy removal.
- In a large mixing bowl, whisk together 1 cup Unsalted butter, melted and slightly cooled, 1 cup Brown sugar, and ½ cup Granulated sugar until smooth.1 cup Unsalted butter, melted and slightly cooled, 1 cup Brown sugar, ½ cup Granulated sugar
- Add 6 egg yolks and 1 teaspoon Vanilla extract, whisking until fully combined.6 egg yolks, 1 teaspoon Vanilla extract
- In a separate bowl, whisk together 2 cups All-purpose flour, 1 teaspoon Baking powder, and ½ teaspoon Salt.2 cups All-purpose flour, 1 teaspoon Baking powder, ½ teaspoon Salt
- Gradually add the dry ingredients to the wet mixture, stirring just until combined. Gently fold in the 1 cup M&M’s .1 cup M&M’s
- Pour the batter into the prepared baking pan and spread it evenly with a spatula. Scatter a few extra M&M’s on top for decoration.
- Bake for 30-45 minutes, or until the edges are golden and a toothpick inserted in the center comes out with a few moist crumbs. Do not overbake to keep the bars chewy.
- Let the bars cool completely in the pan, then lift them out using the parchment overhang. Slice into squares or rectangles.
Nutrition values are estimates only, using online calculators. Please verify using your own data.
⛑️ Food Safety
- Cook to a minimum temperature of 165 °F (74 °C)
- Do not use the same utensils on cooked food, that previously touched raw meat
- Wash hands after touching raw meat
- Don't leave food sitting out at room temperature for extended periods
- Never leave cooking food unattended
- Use oils with high smoking point to avoid harmful compounds
- Always have good ventilation when using a gas stove
For further information, check Safe Food Handling - FDA.
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