These Dark Chocolate Peanut Butter Cup Blondies are a gluten-free take on the classic peanut butter cup bar. They cut back on sugar without sacrificing flavor, bake in about 20 minutes, and are simple to make.
A buttery blondie base studded with dark chocolate, topped with a creamy peanut butter layer and finished with a rich dark chocolate coating — these bars beat store-bought candy hands down.
This dessert is dangerously good — one large square is easily two or three. The combination of a chewy, buttery blondie, quality dark chocolate, and nutty peanut butter creates a decadent, candy-bar-style treat that’s worth making at home.
Why these Blondies Outshine Candy Bars
Homemade bars let you choose higher-quality chocolate and real peanut butter. Using dark chocolate with a higher cocoa percentage gives a deeper, less sweet chocolate flavor than most mass-produced candy. For the peanut butter layer, natural peanut butter (ingredients: peanuts, and optionally salt) delivers true nutty flavor and fewer additives than the typical fluffy varieties.
The blondie base is what ties it all together: a buttery, chewy layer made from oat flour, brown sugar, butter, and baking powder. To keep the bars interesting, fold dark chocolate chunks into the blondie batter for pockets of melty chocolate throughout.
Tips for the Best Chocolate Peanut Butter Blondies
- Use high-quality dark chocolate chunks or chips with cocoa or chocolate listed before sugar in the ingredient list — they melt and taste better.
- When melting chocolate, do it gently: short microwave bursts (20–30 seconds) and frequent stirring prevent scorching. Alternatively use a double boiler.
- If your natural peanut butter is thick, warm it slightly so it spreads easily over the warm blondie layer.
- Add chopped peanuts or flaky sea salt on top of the melted chocolate for texture and a salty contrast.
Ingredients
Blondie Bars:
- 6 tablespoons salted butter, melted
- ¼ cup natural peanut butter
- ½ cup packed brown sugar
- 1 cup oat flour (blend rolled oats if needed)
- ¾ teaspoon baking powder
- ¼ teaspoon salt
- 1 egg
- 1 teaspoon vanilla extract
- ½ cup dark chocolate chunks
Topping:
- ¾ cup natural peanut butter (for the peanut butter layer)
- 1 cup dark chocolate chunks, melted with 1–2 teaspoons coconut oil
- Optional: chopped peanuts or flaky sea salt for garnish
Substitutions & Variations
Less sugar: Try swapping brown sugar for coconut sugar or reducing the sugar slightly. Results may vary.
Different nut or seed butter: Regular peanut butter works, and almond or cashew butter are tasty alternatives. For a nut-free option, use sunflower seed butter.
Vegan: Replace the egg with a flax egg (1 tablespoon ground flaxseed + 3 tablespoons water, chilled) and use dairy-free chocolate chips.
Recipe
Dark Chocolate Peanut Butter Cup Blondies
Gluten-free option using oat flour, ready in about 30 minutes total.
- Prep time: 10 minutes
- Cook time: 20 minutes
- Total time: 30 minutes
- Yield: 9 bars
Instructions
- Preheat oven to 350°F (175°C). Line an 8×8-inch baking dish with parchment paper.
- Melt the butter, then stir in ¼ cup peanut butter until combined.
- In a bowl, combine oat flour, brown sugar, baking powder, and salt.
- Pour the melted butter mixture into the dry ingredients. Add the egg and vanilla, mixing until a sticky dough forms.
- Fold in the ½ cup dark chocolate chunks. Press the mixture into the prepared pan and bake 18–20 minutes, until edges are lightly golden and a toothpick comes out clean.
- While still warm, spoon the remaining ¾ cup peanut butter over the blondies. Let it sit a minute to warm, then gently spread into an even layer.
- Melt 1 cup dark chocolate chunks with 1–2 teaspoons coconut oil in short microwave bursts, stirring frequently, or melt over a double boiler.
- Pour the melted chocolate over the peanut butter layer and tilt the pan to spread the chocolate without mixing into the peanut butter.
- Optional: sprinkle chopped peanuts or flaky sea salt while the chocolate is still wet.
- Chill in the fridge or freezer until the chocolate sets (about an hour). Remove from the pan, transfer to a cutting board, and slice into 9 squares. Store in the refrigerator for up to a week.
Notes
If natural peanut butter is too thick to spread, warm the pan briefly in the oven for a couple of minutes to soften it, then spread.
More Dessert Ideas
- Salted Caramel Pecan Chickpea Blondies
- No-Churn Vanilla Chip Stracciatella Ice Cream
- Dark Chocolate Sea Salt Pumpkin Seed Bark
- Crunchy Caramel Chocolate-Covered Dates
If you make these dark chocolate peanut butter cup blondies, share photos or leave a rating where you found the recipe — feedback is always appreciated.