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Halloween Candy Monster Cookies

Halloween Candy Monster Cookies

Already thinking about what to do with the haul of candy your kids will come home with from Trick-or-Treat? Maybe you overbought and will find yourself with a bunch of leftover candy. Either way, you’ve got what you need to make these amazing Leftover Halloween Candy Monster Cookies!

In an effort to rein in my sweet treats, I’ve told myself that desserts must include a human-made element, so I’ve tried to abstain from dipping directly into my girls’ trick-or-treat bags. This means baked goods created by myself, friends, or small bakeries, ice cream from local shops like Purple Door and chocolates from Indulgence are okay, but anything straight from Hershey, PA is not. In theory, this negates Reese’s Peanut Butter Cups which sounds like a horrible way to live, so I found a loop hole – these Monster Cookies.

Leftover Halloween Candy Monster Cookies Recipe

I picked M&Ms and Peanut Butter Cups for my version of this oat-based cookie, but you could use whatever chocolate-y goodness you love (and/or are trying to use up). I even added in two small baggies of pretzels someone gave my girls at our trick-or-treating. Hunks of Snickers would be fabulous, as would the coconut pizazz of Almond Joys or bust out the Take 5 to get a bunch of stuff in there in one shot. Ultimately, you need two and a half cups of chopped up add-ins, however you want to divide it up. Regular chocolate chips do the trick, too.

[[ recipeID=recipe-8ldjkjlpl, title=Halloween Candy Monster Cookies ]]

Halloween Candy Monster Cookies

A great way to use up all that Halloween candy but these cookies are so good, you'll want to make them year-round!

Servings: 30


  • Prep Time: 0 mins
  • Cook Time: 0 mins
  • Total Time: 0 mins




  • ½ cup unsalted butter
  • ½ cup granulated sugar
  • ½ cup light brown sugar
  • ½ cup peanut butter
  • 1 egg
  • 1 tsp vanilla extract
  • ¼ tsp kosher salt
  • ½ tsp baking soda
  • 1 cup all-purpose flour
  • 1 ¼ cup oats
  • ¾ cup peanut butter cups, chopped
  • 1 cup pretzels, chopped


  1. Cream the butter and sugar together until light and fluffy.
  2. Add the peanut butter and mix well. Then add the egg and vanilla and mix to combine.
  3. Carefully add that salt, baking powder and baking soda. Then slowly add the oats and the flour. Set the mixer on low to combine only until just mixed together.
  4. Mix in M&Ms, peanut butter cups and pretzels. Chill dough for at least 15 minutes in the fridge.
  5. Preheat oven to 350 degrees. Line two sheets with silpats.
  6. Scoop out 1" size cookies and bake for 11-13 minutes. Don't over bake, but do wait until they are just starting to brown on top.
  7. Remove from oven and allow to cool completely on the pan. This won't take long. Store extras in your cookie jar.


Adapted from Tastes Better from Scratch blog.

I know most cookie recipes call for mixing the dry ingredients together before adding them to the butter, sugar, and egg mixture. I’m sure that makes for a perfect cookie, but this version above makes for an almost-perfect cookie with one less dish to clean, so it’s good enough for me. If that hurts your head, combine the flour, oats, salt, baking soda and baking powder together in a large bowl before adding to the wet mixture.

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