Description

These Peanut Butter Blondies combine rich peanut butter flavor with chewy brown sugar sweetness and a delightful crunch from Reese’s Pieces. Baked to perfection in a 9×13-inch pan, these bars are easy to make and perfect for parties, snacks, or anytime you crave a buttery, peanut buttery treat.

Ingredients

Scale

Wet Ingredients

3/4 cup (170g) unsalted butter, melted and slightly cooled
2 cups (400g) packed light or dark brown sugar
3/4 cup (190g) creamy peanut butter
2 large eggs + 1 extra egg yolk
1 Tablespoon pure vanilla extract

Dry Ingredients

2 cups (250g) all-purpose flour (spooned & leveled)
1 teaspoon baking powder
1 teaspoon salt

Mix-Ins

1 and 1/4 cups (about 260g) Reese’s Pieces

Instructions

Preheat and Prepare Pan: Preheat your oven to 350°F (177°C) and position the oven rack in the center. Line a 9×13-inch baking pan with parchment paper, making sure to leave overhangs on the sides for easy removal later. Set aside.
Mix Wet Ingredients: In a large bowl, whisk together the melted butter and brown sugar until just combined. Next, whisk in the creamy peanut butter until smooth. Add the two eggs, the extra egg yolk, and the vanilla extract, then continue whisking until the mixture is fully blended.
Add Dry Ingredients and Fold: Add the flour, baking powder, and salt to the wet mixture. Using a rubber spatula, fold the batter together carefully—it will be very thick. Finally, fold in the Reese’s Pieces evenly throughout the batter. Spread the batter evenly in your prepared pan and optionally sprinkle a few extra Reese’s Pieces on top for a decorative finish.
Bake: Place the pan in the preheated oven and bake for 30 minutes. Check doneness by inserting a toothpick in the center; it should come out with a few moist crumbs but no wet batter. If wet batter remains, continue baking and check every 2 minutes to avoid over-baking, which can dry out the blondies.
Cool and Slice: Remove the pan from the oven and set it on a wire rack to cool completely. Once cooled, use the parchment paper overhang to lift the blondies from the pan. Cut them into squares of your preferred size.
Store: Store any leftover blondies in an airtight container at room temperature for up to 1 week to keep them fresh.

Notes

Ensure the melted butter is slightly cooled before whisking with eggs to prevent scrambling.
Do not over-bake to keep the blondies moist and chewy.
Parchment paper overhang makes removing the bars easy and prevents sticking.
You can substitute Reese’s Pieces with chocolate chips or peanut M&Ms for variation.
For a gluten-free version, substitute all-purpose flour with a gluten-free flour blend.

Prep Time: 15 minutes
Cook Time: 30-34 minutes
Category: Dessert
Method: Baking
Cuisine: American

Keywords: peanut butter blondies, peanut butter dessert, blondie bars, Reese's Pieces dessert, easy blondie recipe, bake from scratch blondies