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Monster Mash Cookie Bars Recipe

4.8 from 98 reviews

Monster Mash Cookie Bars are a fun and festive treat perfect for Halloween or any occasion where you want a colorful, candy-filled dessert. These soft and chewy bars combine classic cookie flavors with chocolate chips, candy-coated chocolates, and playful candy eyeballs for a spooky and delicious twist.

Ingredients

Scale

Cookie Dough

  • 1/2 cup unsalted butter, softened
  • 1/2 cup brown sugar
  • 1/4 cup granulated sugar
  • 1 large egg
  • 1 tsp vanilla extract
  • 1 1/4 cups all-purpose flour
  • 1/2 tsp baking soda
  • 1/4 tsp salt

Add-ins and Toppings

  • 1/2 cup chocolate chips
  • 1/2 cup Halloween M&Ms or candy-coated chocolates
  • 1/4 cup candy eyeballs
  • Optional: sprinkles or chopped candy bars

Instructions

  1. Preheat and Prepare Pan: Preheat your oven to 350°F (175°C). Line an 8×8-inch baking pan with parchment paper to ensure easy removal and clean-up.
  2. Cream Butter and Sugars: In a large mixing bowl, beat the softened unsalted butter, brown sugar, and granulated sugar together until the mixture is light, fluffy, and well combined. This creates a smooth base for your dough.
  3. Add Egg and Vanilla: Mix in the egg and vanilla extract until the mixture is smooth and homogenous, ensuring even flavor and moisture throughout the dough.
  4. Combine Dry Ingredients: Stir in the all-purpose flour, baking soda, and salt until just combined, being careful not to overmix to keep the bars tender.
  5. Fold in Candy and Chocolate: Gently fold in the chocolate chips and Halloween M&Ms or candy-coated chocolates, reserving a small handful of candies and candy eyeballs for topping later.
  6. Spread Dough in Pan: Evenly spread the cookie dough into the prepared 8×8-inch pan using a spatula. Press the reserved candies and candy eyeballs onto the top of the dough to create a fun, festive look.
  7. Bake: Bake in the preheated oven for 20–25 minutes or until the edges are golden brown and the center is set but still soft.
  8. Cool and Cut: Allow the cookie bars to cool completely in the pan on a wire rack before lifting out using the parchment paper. Cut into squares and serve.

Notes

  • For soft cookie bars, avoid overbaking; remove from oven once center is set.
  • You can substitute candy eyeballs with other fun Halloween-themed candies if you prefer.
  • Use parchment paper or grease the pan well for easy removal of bars.
  • Optional sprinkles or chopped candy bars can be added on top or folded into the dough for extra texture and flavor.

Keywords: Halloween cookies, cookie bars, candy cookie bars, festive dessert, chocolate chip bars, monster mash bars