Halloween Reese’s Monster Cookie Bars (One-bowl Dessert)
Chewy, peanut butter monster cookie bars packed with oats, chocolate chips, and colorful Reese’s candies. This one-bowl Halloween dessert is easy to make, festive, and guaranteed to disappear fast at any party.
Equipment
- 9x13" Baking pan
Ingredients
- 1/2 cup Unsalted butter melted
- 1 cup Light brown sugar packed
- 1 cup Granulated white sugar
- 2 whole Eggs room temperature
- 1 tbsp Vanilla extract
- 3/4 cup Creamy peanut butter
- 1 3/4 cups All-purpose flour
- 1 tsp Baking powder
- ½ tsp Salt
- 1 cup Old fashioned oats
- 1 cup Semi sweet chocolate chips
- 9 oz. Reese's Pieces candy
- Assorted Reese's Peanut Butter Cups
- Candy eyeballs
Instructions
- Preheat oven to 350 degrees F. Grease or line an 9x13" baking pan, set aside.
- In a large mixing bowl, combine the melted butter, sugars, vanilla, and eggs. Whisk to combine. Fold in creamy peanut butter until smooth.1/2 cup Unsalted butter, 1 cup Light brown sugar, 1 cup Granulated white sugar , 2 whole Eggs, 1 tbsp Vanilla extract, 3/4 cup Creamy peanut butter
- Slowly add the dry ingredients into the wet ingredients and mix until combined. Fold in the oats and set aside 1/4 of the cookie dough mixture.1 3/4 cups All-purpose flour, 1 tsp Baking powder, ½ tsp Salt, 1 cup Old fashioned oats
- To the remaining 3/4 cookie dough, add in the chocolate chips and Reese's pieces candy (set aside a few extra Reese's candy to sprinkle on top if desired). Fold gently to combine and add to the prepared baking pan, press down to spread out evenly.1 cup Semi sweet chocolate chips, 9 oz. Reese's Pieces candy
- Take the 1/4 cookie dough set aside and crumble evenly over top. Press in the assorted peanut butter cups (small and large) and sprinkle over any remaining Reese's pieces.Assorted Reese's Peanut Butter Cups
- Bake at 350 degrees for 35-40 minutes or until a toothpick inserted comes out clean. Remove from oven and let cool on a wire rack, press candy eyes into the warm Reese's cups. Let cool completely before slicing.Candy eyeballs
Notes
- Candy eyes can be left off to make these a good dessert for year round!
- Customize the candy: Swap in candy corn, Halloween M&M’s, or chopped peanut butter cups for a fun variety.
- Don’t overbake: The bars should look slightly underdone in the center when you pull them out, they’ll firm up as they cool.
- Perfect slices: Let the bars cool completely before cutting to get clean edges and gooey centers.
- Make ahead: These store well for 3-4 days in an airtight container and can be frozen for up to 2 months.
- Cut into strips, squares, or triangles to get the most out of these for serving Halloween parties.
Nutrition
Serving: 1barCalories: 391kcalCarbohydrates: 52gProtein: 7gFat: 18gSaturated Fat: 9gPolyunsaturated Fat: 2gMonounsaturated Fat: 6gTrans Fat: 0.2gCholesterol: 15mgSodium: 168mgPotassium: 217mgFiber: 3gSugar: 35gVitamin A: 163IUCalcium: 50mgIron: 2mg