Looking for a dessert that’s quick, irresistible, and guaranteed to be a crowd-pleaser? These Reese’s Pieces Chocolate Chip Cookie Bars are the ultimate sweet treat. Packed with gooey chocolate chips and crunchy peanut butter candy, this recipe combines convenience with indulgence. Whether you need an easy bake-sale item, a kid-friendly snack, or a last-minute dessert for family gatherings, these cookie bars deliver big flavor with minimal effort.
Unlike traditional cookies, these bars are baked in one pan, making them a no-fuss dessert perfect for busy days. Plus, they’re made with a yellow cake mix base, which cuts down prep time while still giving you a chewy, bakery-style texture.
Why You’ll Love This Recipe
- Easy to Make: Just one bowl and a few pantry staples.
- Family-Friendly: Kids love the colorful Reese’s Pieces on top.
- Perfect Texture: Soft, chewy, and slightly gooey in the center.
- Versatile Dessert: Great for holidays, parties, or simple weeknight treats.
About the Ingredients
Yellow Cake Mix
A shortcut ingredient that creates a soft and chewy base.
Butter
Melted butter adds richness and keeps the bars moist.
Vanilla Extract
Enhances the flavor profile with a sweet, warm note.
Eggs
Help bind the mixture and provide structure.
Chocolate Chips
Give these bars a gooey, chocolatey bite in every square.
Reese’s Pieces
Add crunch, color, and that irresistible peanut butter flavor.
Tips & Tricks
Use Parchment Paper
Line your baking pan with parchment paper for easy lifting and cutting of the bars.
Avoid Overbaking
The bars will continue to cook as they cool, so take them out when the edges are just golden.
Sprinkle Sea Salt
For a sweet-salty twist, add a sprinkle of sea salt on top before baking.
Pro Tips
- Use room temperature ingredients to ensure even mixing.
- Chill the dough for 15 minutes to prevent spreading.
- Press the Reese’s Pieces lightly to prevent them from falling off.
Step-by-Step Instructions
Preheat the Oven
Set your oven to 350°F (175°C) and allow it to preheat while you prepare the batter.
Mix the Base Ingredients
In a large mixing bowl, combine the cake mix, melted butter, vanilla extract, and eggs. Stir until the mixture is smooth and well-blended.
Add Chocolate Chips
Gently fold in the chocolate chips, ensuring they are evenly distributed throughout the batter.
Prepare the Baking Pan
Grease a 9x13-inch baking pan or line it with parchment paper for easy removal.
Spread the Batter
Press the prepared batter evenly into the pan, ensuring it reaches all corners.
Top with Reese’s Pieces
Sprinkle the Reese’s Pieces over the top of the batter and press them lightly into the surface.
Bake the Bars
Bake in the preheated oven for 20–25 minutes, or until the edges are golden and a toothpick inserted into the center comes out clean.
Cool and Cut
Allow the bars to cool in the pan before cutting them into squares for serving.
Delicious Variations
Double Chocolate
Use chocolate cake mix instead of yellow for a richer chocolate flavor.
Peanut Butter Lovers
Add ½ cup of creamy peanut butter to the batter for an extra nutty taste.
Candy Mix-In
Swap Reese’s Pieces for M&M’s, mini peanut butter cups, or chopped Snickers for variety.
How to Store Reese’s Pieces Chocolate Chip Cookie Bars
Refrigerator
Store in an airtight container for up to 1 week to keep them fresh and chewy.
Freezer
Wrap the bars tightly and freeze for up to 2 months. Thaw at room temperature before serving.
Room Temperature
These bars can be kept at room temperature in an airtight container for up to 3 days.
Reheating
For a warm treat, microwave individual bars for 10-15 seconds before serving.
Frequently Asked Questions
Can I use a different cake mix?
Yes! White or chocolate cake mix works well too.
Do I have to use Reese’s Pieces?
Nope—you can swap them with any candy-coated chocolates.
How do I make them chewier?
Reduce baking time slightly and let them cool completely before cutting.
Can I make these gluten-free?
Yes, just use a gluten-free yellow cake mix.
What’s the best way to cut these bars?
Use a sharp knife and wipe it clean between cuts for neat squares.