These Dark Chocolate Peanut Butter Cup Blondies are a crowd-pleasing treat: gluten-free if you use oat flour, reduced in added sugar, and ready in about 20 minutes in the oven. They’re simple to prepare and rich in flavor—think buttery blondies layered with creamy peanut butter and a glossy dark chocolate finish.
Buttery blondie squares studded with dark chocolate and topped with a smooth peanut butter layer and a final coat of melted dark chocolate. Once you try these, packaged candy bars will feel secondary.
This dessert is dangerously good. I’ll confess: I once cut a single large square in half thinking that would be enough—then went back for the other half and maybe a tiny sliver after that. These nut-butter and dark chocolate blondies are that irresistible.
Why these Dark Chocolate Peanut Butter Cup Blondies Beat Store-Bought Candy
These homemade blondies outshine many mass-produced peanut butter candies for a few reasons. First, you control the chocolate: use high-quality dark chocolate chips, chunks, or a high-cocoa chocolate bar for a richer, more decadent top layer than most packaged candy offers.
Second, choose a natural-style peanut butter for a real nutty taste. Natural peanut butter (ideally labeled “peanuts” or “peanuts and salt”) brings a deep roasted flavor and less added sugar than the fluffy, processed varieties. It gives these blondies that authentic peanut butter cup profile.
Finally, the blondie base itself is buttery and chewy—the foundation you expect in a blondie bar. This recipe uses oat flour, brown sugar, butter, and baking powder to create a thick, cookie-like bottom. For extra texture and pockets of chocolate in each bite, we fold dark chocolate chunks into the blondie batter before baking.
Tips for Making the Best Chocolate Peanut Butter Blondies
Use high-quality dark chocolate with a higher cocoa percentage for a clean, less sweet chocolate topping. When melting chocolate, go slow: microwave in short bursts (20–30 seconds) and stir between intervals, or use a double boiler to avoid scorching.
If your peanut butter is very thick, warm it slightly so it spreads smoothly over the warm blondies. When pouring the melted chocolate layer, tilt the pan gently to encourage even coverage without mixing into the peanut butter layer.
Ingredients Overview
- Butter: salted butter adds the right balance of sweet and savory—use what you prefer.
- Peanut Butter: natural peanut butter (peanuts, maybe salt) for true nut flavor; regular peanut butter also works.
- Oat Flour: homemade by blending rolled oats or use store-bought oat flour. All-purpose flour can substitute if desired.
- Salt: a small amount enhances flavor and balances sweetness.
- Brown Sugar: packed brown sugar adds moisture and caramel notes.
- Baking Powder: a little lift for the blondie base.
- Egg: binds ingredients and creates a chewy texture.
- Vanilla Extract: enhances overall flavor.
- Chocolate Chips/Chunks: use high-quality dark chocolate for both batter and topping.
- Coconut Oil (optional): helps thin melted chocolate for easier spreading.
- Chopped Peanuts (optional): for extra crunch on top.
Substitutions and Variations
Less sugar: You can try replacing brown sugar with coconut sugar or using a modest amount of maple syrup—results may vary, so test and adjust.
Different nut or seed butter: Regular peanut butter, almond butter, cashew butter, or sunflower seed butter (for a nut-free option) will all work. Expect slight flavor and texture differences.
Vegan option: Substitute the egg with a flax egg (1 tbsp ground flax + 3 tbsp water, chilled) and use dairy-free chocolate. Texture may change slightly but it’s a good plant-based alternative.
Recipe
Dark Chocolate Peanut Butter Cup Blondies
These Dark Chocolate Peanut Butter Cup Blondie Bars are easy to make, bake in about 20 minutes, and make a rich, satisfying treat.
- Prep Time: 10 minutes
- Cook Time: 20 minutes
- Total Time: 30 minutes
- Yield: 9 bars
Ingredients
Blondie Bars:
- 6 tablespoons salted butter, melted
- 1/4 cup natural peanut butter
- 1/2 cup packed brown sugar
- 1 cup oat flour (blended rolled oats)
- 3/4 teaspoon baking powder
- 1/4 teaspoon salt
- 1 egg
- 1 teaspoon vanilla extract
- 1/2 cup dark chocolate chunks
Topping:
- 3/4 cup natural peanut butter (for the peanut butter layer)
- 1 cup dark chocolate chunks, melted with coconut oil
- 1–2 teaspoons coconut oil (optional, to thin chocolate)
- Optional: chopped peanuts or flaky sea salt for garnish
Instructions
- Line an 8×8-inch baking dish with parchment paper and preheat the oven to 350°F (175°C).
- Melt the butter, then stir in 1/4 cup peanut butter until combined.
- In a mixing bowl, combine oat flour, brown sugar, salt, and baking powder.
- Pour the melted butter and peanut butter mixture into the dry ingredients, then add the egg and vanilla. Mix until a sticky dough forms.
- Fold in the dark chocolate chunks, press the dough evenly into the prepared baking dish, and bake at 350°F for 18–20 minutes, until the edges are lightly golden and a toothpick comes out clean.
- While the bars are still warm, dollop the remaining 3/4 cup peanut butter on top. Let it sit a minute to soften, then gently spread into an even layer.
- Melt 1 cup chocolate chunks with 1–2 teaspoons coconut oil in short microwave bursts (20–30 seconds), stirring frequently, or use a double boiler. Heat slowly to avoid burning.
- Pour the melted chocolate over the peanut butter layer and tilt the pan to coat evenly without blending into the peanut butter layer.
- Optional: sprinkle chopped peanuts or flaky sea salt over the melted chocolate for crunch and contrast.
- Refrigerate or freeze until the chocolate sets, at least one hour. Lift the slab from the pan using the parchment, place on a cutting board, and slice into 9 squares. Store chilled for up to a week.
Notes
If your natural peanut butter is thick or separated, warm the pan briefly in the oven for a couple of minutes after baking to make spreading easier.
If you make these dark chocolate peanut butter cup blondies, consider sharing a photo and feedback—they’re a real crowd-pleaser!