Reese’s Pieces Chocolate Chip Cookie Bars

Looking for a dessert that’s loaded with chocolatey goodness? These Reese’s Pieces Chocolate Chip Cookie Bars are the ultimate treat for peanut butter and chocolate lovers!

Imagine soft, chewy cookie bars packed with rich chocolate chips and colorful Reese’s Pieces candies. The combination of peanut butter and chocolate in every bite makes these bars a deliciously irresistible snack.

These cookie bars are perfect for any occasion—whether you’re craving something sweet, bringing a treat to a party, or just indulging in a moment of chocolatey bliss. They’re guaranteed to be a crowd favorite!

Ready to bake up something amazing? Let’s get started and make these Reese’s Pieces Chocolate Chip Cookie Bars today!

Why You’ll Love This Recipe

• Perfect Texture: Soft in the center, golden at the edges, with just the right balance of chew and crunch.
• Chocolate + Peanut Butter Combo: Sweet milk chocolate chips meet nutty peanut butter chips and Reese’s candy in every bite.
• No-Chill Dough: No need to wait—mix the dough and bake right away.
• Kid-Friendly & Crowd-Pleasing: A fun, colorful treat that everyone grabs first from the dessert table.

What You Need to Know Before You Start

Prep Time & Bake Time
Prep Time: 20 minutes
Bake Time: 25–30 minutes
Total Time: About 50 minutes

Servings
Makes about 16 bars in a 9×13″ pan. Slice into smaller squares for bite-sized party treats or leave big for classic bar-style dessert.

Difficulty
Easy – A one-bowl recipe that doesn’t require any special skills.

Required Kitchen Tools

• Mixing bowls (one large, one medium)
• Rubber spatula or wooden spoon
• Measuring cups and spoons
• Hand mixer or stand mixer (optional but helpful)
• 9×13-inch baking dish
• Parchment paper or cooking spray
• Cooling rack
• Knife for slicing bars

Ingredients for Reese’s Pieces Chocolate Chip Cookie Bars

Here’s everything you need to make these chewy, gooey bars. Exact measurements are in the recipe card below.

• 1 box yellow cake mix – This is the base of the dough, making it quick and consistent.
• 2 large eggs – Help bind the dough and add richness.
• 1 teaspoon vanilla extract – Adds warm, sweet flavor.
• 5 tablespoons unsalted butter, melted – Gives the bars richness and keeps them soft.
• 2 tablespoons milk or cream (or water) – Just enough moisture to bring the dough together.
• ¼ teaspoon salt – Balances sweetness.
• 1 cup milk chocolate chips (or semi-sweet) – Melty pockets of chocolate in every bite.
• ¼ cup peanut butter chips – A nutty, creamy contrast to the chocolate.
• 1 cup mini Reese’s Cups, chopped – Pressed into the batter for bursts of peanut butter.
• Extra milk chocolate chips + extra mini Reese’s Cups for topping – Makes the bars look and taste even better.

Variations for Reese’s Pieces Cookie Bars

• Swap the Chips: Use white chocolate chips or butterscotch chips instead of peanut butter for a different twist.
• Add Crunch: Fold in chopped pretzels or roasted peanuts for added texture.
• Make it Gluten-Free: Use a gluten-free yellow cake mix and check that all candies are certified gluten-free.
• Drizzle on Top: Add a drizzle of melted chocolate or peanut butter after baking for a fancier finish.
• Holiday Twist: Use themed Reese’s Pieces (like red and green for Christmas) to make it festive.

How to Make Reese’s Pieces Chocolate Chip Cookie Bars

Step 1: Preheat the Oven

Preheat your oven to 350°F (177°C). Line a 9×13-inch baking pan with parchment paper or lightly grease it with butter or cooking spray.

Step 2: Mix the Wet Ingredients

In a large bowl, combine:

• 2 large eggs
• 1 teaspoon vanilla extract
• 5 tablespoons melted unsalted butter
• 2 tablespoons milk (or cream or water)

Whisk until smooth.

Step 3: Add Cake Mix

Add the box of yellow cake mix and ¼ teaspoon salt to the bowl. Stir with a spatula until a thick dough forms. It will be sticky—don’t worry.

Step 4: Fold in the Goodies

Gently fold in:

• 1 cup milk chocolate chips
• ¼ cup peanut butter chips
• 1 cup chopped mini Reese’s Cups

Mix until the candies are evenly spread throughout the dough.

Step 5: Press into the Pan

Spread the dough evenly into your prepared baking pan. Use your fingers or a spatula to press it down. Sprinkle extra chocolate chips and chopped mini Reese’s Cups over the top.

Step 6: Bake

Bake at 350°F for 25–30 minutes, or until the edges are golden and the center is set. A toothpick inserted should come out with a few moist crumbs but no raw batter.

Step 7: Cool and Slice

Let the bars cool completely in the pan on a wire rack—this helps them set up for clean slicing. Once cool, cut into squares or rectangles as desired.

How to Serve Reese’s Pieces Chocolate Chip Cookie Bars

These bars are versatile and easy to dress up or keep simple:

• As-Is: Serve at room temperature with a cold glass of milk.
• Warm with Ice Cream: Heat slightly and top with a scoop of vanilla or peanut butter ice cream.
• Party Platter: Arrange with other bar cookies or brownies for a colorful dessert tray.
• Lunchbox Treat: Wrap individual bars in parchment or foil for a lunch or after-school snack.

Storage and Make-Ahead Tips

• Room Temperature: Store in an airtight container at room temperature for up to 4 days.
• Refrigerator: To keep them extra fresh, refrigerate for up to 1 week.
• Freezer: Wrap individually and freeze in a zip-top bag for up to 2 months. Thaw at room temperature or warm slightly before serving.

Tips and Tricks for Success

• Don’t Overbake: Bars may look slightly soft in the center when you pull them from the oven. They’ll firm up as they cool.
• Line the Pan: Parchment paper helps lift the bars out cleanly after baking.
• Even Topping: Press extra Reese’s and chocolate chips gently into the top before baking to ensure they don’t sink into the batter.
• Use a Plastic Knife: For cleaner slices, use a plastic knife or warm your metal knife between cuts.
• Cool Completely: Letting the bars cool before cutting gives them the best texture and shape.

Nutrition Information (Estimated Per Serving)

Nutrient	Amount (per bar)
Calories	310
Total Fat	16g
Saturated Fat	7g
Cholesterol	35mg
Sodium	230mg
Total Carbohydrates	38g
Dietary Fiber	1g
Sugars	26g
Protein	3g

Note: Nutrition values may vary based on specific brands used.

Reese’s Cookie Bars FAQs

Can I use different candy instead of Reese’s?
Yes, you can swap in M&Ms, peanut butter cups, or chopped candy bars.

Can I double this recipe?
Yes. Use two pans or a larger baking dish and increase the bake time slightly.

Why is the dough so thick?
That’s normal! It’s more like cookie dough than cake batter. Use a spatula or your hands to press it evenly in the pan.

Conclusion

I’ve made these bars dozens of times—at bake sales, birthdays, and quiet nights when only chocolate and peanut butter will do. They come together with pantry staples, and the colors from the Reese’s Pieces make them look as good as they taste. If you’re looking for a dessert that’s easy, crowd-pleasing, and truly comforting, this is it.