These peanut butter cup blondies are thick, chewy, and filled with chopped peanut butter cups for an irresistibly rich treat. Made in just one bowl, they’re an easy dessert that’s perfect for peanut butter lovers.

a peanut butter cup blondie with chopped peanut butter cups stuffed inside a peanut butter blondie bar

If you’re a fan of peanut butter and chocolate, these peanut butter cup blondies deserve a spot on your baking list. A rich peanut butter blondie batter surrounds a generous layer of chopped peanut butter cups, creating thick, bakery-style bars with plenty of peanut butter flavor in every bite.

The best part? They’re surprisingly easy to make. Everything comes together in one bowl, and the simple ingredients do all the work. Whether you’re baking for a party, sharing with friends, or simply treating yourself, these blondies are guaranteed to disappear quickly.

Why You’ll Love These Peanut Butter Cup Blondies

Bakery-style at home. Thick, chewy blondies with plenty of peanut butter cups make every square feel like a bakery treat.
Big peanut butter flavor. Creamy peanut butter in the batter and a generous layer of peanut butter cups create the perfect peanut butter-and-chocolate combination.
Easy to make. The batter comes together in one bowl with simple pantry staples.
Perfectly rich and chewy. These blondies are soft, sturdy, and satisfyingly chewy without being overly dense.
Great for sharing. Cut them into nine generous bakery-style blondies or sixteen smaller squares for parties and dessert trays.

Updated for even better results! This recipe now features a thicker, chewier blondie, a generous layer of peanut butter cups, and an easy one-bowl method.

overhead view of ingredients for peanut butter cup blondies

Key Ingredients

Creamy peanut butter – Use a regular creamy peanut butter like Jif or Skippy for the best texture and consistent results. Natural peanut butter can separate and affect the texture of the blondies.
Light brown sugar – Brown sugar gives these blondies their soft, chewy texture and adds a rich caramel-like flavor that pairs perfectly with peanut butter.
Peanut butter cups – A generous layer of chopped peanut butter cups creates pockets of chocolate and peanut butter throughout every blondie. Reserve some for the top so everyone knows what’s inside before taking a bite.
Melted butter – Using melted butter keeps this a simple one-bowl recipe while helping create a dense, chewy blondie instead of a cakier bar.

How to Make Peanut Butter Cup Blondies

Combine the wet ingredients.
Whisk together the melted butter, peanut butter, and brown sugar until smooth. Add the eggs and vanilla, mixing until the batter is well combined and glossy.

melted butter, peanut butter, brown sugar, eggs, and vanilla combined in a mixing bowl — Whisk wet ingredients and peanut butter until smooth and glossy.

peanut butter blondie batter in a mixing bowl — Whisk wet ingredients and peanut butter until smooth and glossy.

Mix in the dry ingredients.
Stir in the flour, baking powder, and salt just until combined. Overmixing can make the blondies less tender.

Layer the batter and filling.
Spread about two-thirds of the batter into the prepared pan. Sprinkle the chopped peanut butter cups evenly over the batter, leaving a small border around the edges. Dollop the remaining batter over the top and gently spread it to cover most of the filling. Scatter the reserved peanut butter cups over the top.

peanut butter blondie batter spread in a square baking pan — Spread part of the batter in the pan.

chopped peanut butter cups scattered on top of peanut butter blondie batter — Spread part of the batter in the pan.

Bake.
Bake until the edges are golden and set and the center is just set. A toothpick inserted into the blondie (not a peanut butter cup) should come out with a few moist crumbs.

Cool completely.
Allow the blondies to cool completely in the pan before lifting them out and cutting into squares. If desired, sprinkle with flaky sea salt before serving for a little extra crunch and a delicious sweet-and-salty finish.

overhead view of sliced peanut butter blondies on parchment paper

Tips for Success

Use regular creamy peanut butter. Stick with a processed brand like Jif or Skippy for the most reliable texture. Natural peanut butter can make the batter oily or crumbly.
Don’t over-mix the batter. Once you add the dry ingredients, stir just until no streaks of flour remain. Over-mixing can make the blondies less tender.
Use your favorite peanut butter cups. Regular or miniature peanut butter cups both work well. Just chop them into bite-size pieces so they’re evenly distributed throughout the blondies.
Reserve peanut butter cups for the top. Pressing a few extra pieces into the batter before baking makes the finished blondies look as good as they taste.
Bake just until set. The edges should be lightly browned, while the center should still look slightly soft. They’ll continue to set as they cool, giving you that chewy bakery-style texture.
Cool before slicing. It can be tempting to cut into them while they’re warm, but letting them cool completely helps the blondies set and makes for cleaner slices.
Finish with flaky salt. A light sprinkle adds a subtle crunch and balances the sweetness and richness of the peanut butter and chocolate.

stack of three peanut butter blondies filled with chopped peanut butter cups

How to Store

Room temperature: Place the cooled blondies in an airtight container and store at room temperature for up to 3 days.

Refrigerator: For longer storage, refrigerate in an airtight container for up to 1 week. Let them sit at room temperature for 15 to 20 minutes before serving if you prefer a softer texture.

Freezer: Wrap individual blondies or place them in a freezer-safe container with parchment paper between the layers. Freeze for up to 3 months. Thaw overnight in the refrigerator or for about an hour at room temperature.

A Bakery-Worthy Treat for Peanut Butter Lovers

If you love the classic combination of peanut butter and chocolate, these peanut butter cup blondies are sure to become a favorite. They’re thick, chewy, and filled with plenty of peanut butter cups, making every bite rich, satisfying, and just a little over the top.

Whether you’re baking them for a party, sharing them with friends, or keeping a batch on the counter for yourself, these bakery-style blondies are always a welcome treat. If you give them a try, I’d love to hear what you think! Leave a comment below and don’t forget to rate the recipe.

a peanut butter cup blondie on a white plate

More Chocolate and Peanut Butter Desserts

Chocolate Peanut Butter Cookies

Peanut Butter Chocolate Chip Cake

No-Bake Peanut Butter Chocolate Bars

Peanut Butter Cup Cheesecake

overhead view of thick, chewy peanut butter cup blondies

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