Chewy Halloween cookie bars loaded with candy and topped with chocolate frosting.

These Spooky Sprinkle Cookie Bars start with M&M’s Ghoul’s Mix sugar cookie dough, pressed into a pan and baked until the edges are perfectly golden with a soft, chewy center. A thick layer of creamy chocolate frosting goes on top along with a ton of Halloween sprinkles to finish. Zero scooping. Zero chilling. Just mix, bake, frost, and slice. If you need a Halloween dessert that still feels special, this one always delivers.

Why You’ll Love This Recipe

• Easy Halloween cookie bar recipe with no chill time needed.
• Packed with chocolate candies for color and crunch.
• Chewy texture that stays soft for days.
• A thick layer of chocolate frosting on top.
• Perfect dessert idea for kids Halloween parties.
• Halloween sprinkles make every square look cute on a tray.
• Semi homemade shortcut that tastes bakery style.

Ingredient Notes

• M&M’s Ghoul’s Mix cookie dough: gives you Halloween colors baked right in. No extra mix ins required.
• Salted butter: adds richness and balances the sweetness of the frosting.
• Milk or cream: allows you to control the smoothness and thickness of the frosting. Add it slowly so the frosting stays fluffy rather than runny.
• Halloween sprinkles: help set the theme. Go with eyeballs, bones, bats, or just bright seasonal colors.

Before You Bake

How do I know when the bars are done?
The center should look set but still soft. The edges turn lightly golden. They will continue to firm up as they cool.

Can I make them thicker?
Yes, press the dough into a smaller pan or stack two packages of dough for a super thick bakery style bar. Increase the bake time a few minutes.

Can I prep these ahead?
Yes. Bake the cookie base a day early. Frost and decorate the next day to save time before a party.

Spooky Sprinkle Cookie Bars

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• Author: Taryn Camp

Ingredients

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Cookie Bars

• 1 package Nestlé Toll House M&M’s Ghoul’s Mix Sugar Cookie Dough (14 oz)

Chocolate Frosting

• ½ cup salted butter softened
• 1 ½ cups powdered sugar
• ¼ cup unsweetened cocoa powder
• 2 to 3 tablespoons milk or cream
• ½ teaspoon vanilla extract
• Halloween sprinkles for topping

Instructions

1. Preheat the oven to 350°F. Line an 8×8 inch square pan with parchment paper so the bars lift out easily.
2. Open the cookie dough and press it evenly into the bottom of the pan. Smooth the top with slightly damp fingertips or an offset spatula.
3. Bake for 18 to 22 minutes until the edges are lightly golden and the center looks set. Avoid overbaking to keep the bars soft.
4. Cool completely before frosting so the topping does not melt.
5. In a medium bowl, beat the butter until fluffy. Add powdered sugar, cocoa powder, milk, and vanilla. Beat until creamy and smooth. Add a splash more milk if needed to help it spread easily.
6. Spread the frosting over the cooled cookie bar base. Add sprinkles across the top.
7. Chill for 15 minutes to help the frosting set. Lift the bars out of the pan and slice into squares.

FAQ

How should I store them?
Keep them covered and refrigerated for up to 4 days. They stay soft and delicious when chilled.

Can I change the frosting flavor?
Yes vanilla frosting tinted orange or purple looks awesome for Halloween. Peanut butter frosting is also delicious with M&M cookie dough.

Can I freeze them?
Yes, slice first and freeze airtight for up to 2 months. Thaw in the fridge before serving.

Can I add more candy or sprinkles?
Absolutely press more M&Ms on top before baking or sprinkle extra on the frosting.

Sprinkle of Fun

Turn these Spooky Sprinkle Cookie Bars into the official treat of your Halloween costume contest. Set them out on a decorated table next to ballots and let each guest grab a square before they vote. After everyone casts their votes, hand out a bunch of different creative awards. The bars become part of the celebration, and everyone gets a sweet reward for showing up in style.