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Reese’s Pieces Cookie Bars

Lisa

By Lisa

Feb 26, 2026

15 min prep
30 min cook
12 servings
Jump to Recipe
Reese’s Pieces Cookie Bars

Are you ready to indulge in a sweet treat that perfectly balances creamy peanut butter with colorful bursts of candy? These Reese’s Pieces Cookie Bars are not only delightfully chewy but also irresistibly rich, making them a crowd-pleasing dessert for any occasion. Whether it’s Halloween or just a craving for something sweet, this quick and no-fuss recipe will have you reaching for seconds!

With just a handful of ingredients and simple steps, you can whip up these delightful bars in no time. The combination of creamy peanut butter and sugary sweetness will make your taste buds dance, and the vibrant colors of the Reese’s Pieces will brighten any dessert table. Let’s dive into why you’ll fall in love with this recipe!

Why You'll Love This Recipe

  • Quick and Easy: With minimal prep and baking time, you can have these bars ready in under an hour!
  • Peanut Butter Perfection: The creamy peanut butter base creates a rich, satisfying texture in every bite.
  • Colorful and Fun: The Reese’s Pieces add a pop of color and a delightful crunch that kids and adults will adore.
  • Perfect for Sharing: Cut into squares, these bars are perfect for parties, potlucks, or just a cozy night in.

About the Ingredients

Creamy Peanut Butter

This ingredient is the star of the show, providing a rich, nutty flavor and a smooth texture that binds the bars together.

Granulated Sugar

The sugar adds sweetness and helps achieve that wonderfully chewy texture that makes these bars so irresistible.

Large Egg

The egg acts as a binding agent, ensuring that the bars hold together beautifully while adding moisture.

Vanilla Extract

A splash of vanilla enhances the flavors, bringing warmth and depth to the overall taste of the bars.

Reese’s Pieces Candies

These colorful candies not only provide a delightful crunch but also infuse the bars with bursts of peanut butter flavor and fun color.

Non-Stick Spray or Parchment Paper

Essential for easy removal of the cookie bars from the pan, ensuring they come out perfectly without sticking.

Tips & Tricks

Use Natural Peanut Butter

If you prefer a healthier option, opt for natural peanut butter for a more wholesome flavor.

Don’t Overmix the Batter

Mix just until combined to keep your cookie bars soft and chewy; overmixing can lead to a denser texture.

Let Them Cool

Allow the bars to cool in the pan before cutting to ensure clean, beautiful squares.

Customize Your Toppings

Feel free to mix in your favorite nuts or chocolate chips along with the Reese’s Pieces for added texture and flavor.

Pro Tips

  • Check for Doneness: Bake until the edges are golden; a toothpick should come out with a few moist crumbs.
  • Use a Sharp Knife: For clean cuts, use a sharp knife to slice the bars once they have cooled.
  • Store Properly: Keep the bars in an airtight container to maintain their freshness and chewiness.
  • Make Ahead: These bars can be made a day in advance, making them perfect for parties or gatherings.

Step-by-Step Instructions

Preheat the Oven

Start by preheating your oven to 350°F (175°C) and prepare a 9x9-inch baking dish with non-stick spray or parchment paper.

Mix Peanut Butter and Sugar

In a mixing bowl, combine the creamy peanut butter and granulated sugar. Mix until well blended and smooth.

Add Egg and Vanilla

Incorporate the large egg and vanilla extract into the peanut butter mixture, stirring until fully combined.

Fold in the Candies

Gently fold in the Reese’s Pieces candies, making sure to reserve a handful for topping later.

Bake and Cool

Pour the mixture into the prepared pan, top with reserved candies, and bake for 25-30 minutes until edges are golden. Let cool before cutting.

Delicious Variations

Chocolate Chip Addition

Add semi-sweet or milk chocolate chips to the batter for an extra layer of chocolatey goodness.

Nutty Surprise

Incorporate chopped peanuts or walnuts for added crunch and a nutty flavor that complements the peanut butter.

Marshmallow Swirl

Fold in mini marshmallows before baking for a gooey, delicious twist that kids will love.

How to Store Reese’s Pieces Cookie Bars

Refrigerator

Store the bars in an airtight container in the refrigerator for up to one week, keeping them fresh and chewy.

Freezer

For longer storage, freeze the bars in a single layer, then transfer to a freezer-safe container for up to three months.

Reheating

Reheat in the microwave for a few seconds to enjoy a warm, gooey treat straight from the fridge or freezer.

Frequently Asked Questions

Can I use crunchy peanut butter?

Yes! Crunchy peanut butter will add an extra layer of texture to your cookie bars.

How do I know when they are done baking?

Look for golden edges and a toothpick inserted in the center should come out with a few moist crumbs.

Can I substitute the Reese’s Pieces with another candy?

Absolutely! M&M's, chocolate chips, or any other candy can be used for a fun twist.

What should I do if the bars are too crumbly?

If the bars are crumbly, they might need more binding; ensure you mix the egg fully and consider adding a little extra peanut butter next time.

These Reese’s Pieces Cookie Bars are sure to become a favorite in your home! Whether you’re treating yourself or sharing with friends and family, they’re a delightful way to satisfy your sweet tooth. Give this recipe a try and let the deliciousness unfold!

Reese’s Pieces Cookie Bars

Reese’s Pieces Cookie Bars

These chewy and rich Reese’s Pieces Cookie Bars are loaded with peanut butter flavor and bursts of colorful candy. A quick, no-fuss dessert perfect for Halloween or any sweet craving!

15 min
Prep Time
30 min
Cook Time
12
Servings
350 kcal
Calories

Ingredients

Instructions

  1. 1 Preheat your oven to 350°F (175°C). Prepare a 9x9-inch baking dish with non-stick spray or parchment paper.
  2. 2 In a mixing bowl, combine the creamy peanut butter and granulated sugar. Mix until well blended.
  3. 3 Add the egg and vanilla extract. Stir until fully incorporated.
  4. 4 Fold in the Reese’s Pieces candies, reserving a handful for topping later.
  5. 5 Pour the mixture into the prepared pan and spread evenly with a spatula.
  6. 6 Top with the reserved Reese’s Pieces, pressing them gently into the surface.
  7. 7 Bake for 25–30 minutes or until edges are golden and a toothpick inserted comes out clean.
  8. 8 Remove from oven and let cool in the pan for about 20 minutes.
  9. 9 Lift out using parchment paper (if used) and cut into bars or squares.

Chef's Note

For an extra indulgent touch, drizzle with melted chocolate after baking. You can also use crunchy peanut butter for added texture. Store leftovers in an airtight container for up to 5 days.

Servings: 12

Cuisine: American

Course: Dessert

Nutrition (per serving): 12gg protein