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Close up photo of Halloween Monster cookies on a white plate on a black and white striped napkin.
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5 from 4 votes

Halloween Monster Cookies

Halloween Monster Cookies are scary delicious! These treats are made with chocolate cake mix, quick oats, and peanut butter, then loaded with M&Ms and chocolate chips. Decorated with Halloween sprinkles and candy eyeballs, this is a festive recipe to make with the kiddos!
Prep Time15 mins
Cook Time15 mins
Total Time30 mins
Course: Dessert
Cuisine: American
Servings: 36 cookies
Calories: 158kcal



  • Heat oven to 350°F and line a baking sheet with parchment paper; set aside.
  • In a large bowl or stand mixer fitted with a paddle attachment, mix together the cake mix, brown sugar, butter, peanut butter, milk, egg, and vanilla on medium speed until fully combined.
  • Stir in the oats, M&Ms, and chocolate chips just until combined.
  • Use a medium cookie scoop, drop balls of dough 2 inches apart on the prepared baking sheet.
  • Add sprinkles to the tops of the cookie dough balls, gently pressing them into the dough.
  • Bake for 12 to 15 minutes. Immediately after coming out of the oven, gently press candy eyes into the cookies (don't add them before baking or they will melt).
  • Cool for 5 minutes on the cookie sheet before transferring to a cooling rack to cool completely.


  • Keep these in an airtight container at room temperature for 2 to 3 days.
  • Substitutions & Variations: 
    • Chocolate chips: You can use milk chocolate, dark chocolate, white, or even peanut butter chips instead. Or, get crazy and add ¼ cup of two different kinds!
    • Cake Mix: Feel free to swap out the chocolate cake mix for another flavor! I personally like chocolate, but you could use a yellow or vanilla cake mix for a more traditional monster cookie flavor.


Calories: 158kcal | Carbohydrates: 17g | Protein: 2g | Fat: 9g | Saturated Fat: 4g | Cholesterol: 15mg | Sodium: 155mg | Potassium: 94mg | Fiber: 1g | Sugar: 11g | Vitamin A: 131IU | Calcium: 31mg | Iron: 1mg