Made with brown sugar and melted butter, these Peanut Butter Blondies are chewy, lightly crisped at the edges, and loaded with peanut butter chips and chopped mini cups.
Preheat the oven to 350 degrees Fahrenheit (177 degrees Celsius). Line a 9x13-inch metal baking pan with foil and set aside.
In a medium saucepan set over medium heat, combine the butter, peanut butter, and brown sugar. Stir until the mixture is completely melted. Remove from the heat and stir in the vanilla. Transfer the mixture to a large mixing bowl. Allow to cool for 5 minutes before adding the eggs, one at a time, mixing well after each addition.
In a medium mixing bowl, whisk together the flour, salt, and baking powder. Gradually add the dry ingredients to the wet ingredients. Mix until only a few streaks of flour remain, then add the peanut butter chips and peanut butter cups. Fold until combined.
Spread the thick batter into the prepared baking pan and smooth the top. Add additional chips and peanut butter cups to the top for a decorative touch, if desired.
Place in the oven and bake for 20–24 minutes or until the blondies are set. Do not overbake. Remove from the oven and allow to cool in the pan for 20 minutes before cutting and serving.
Notes
*I used mini peanut butter cups from Trader Joe’s—they’re much smaller than Reese’s mini peanut butter cups.STORE Peanut Butter Cup Blondies in an airtight container at room temperature for up to 4 days. To help keep them soft, tuck a slice of sandwich bread inside the container to retain moisture. To FREEZE, wrap each bar tightly in plastic wrap and place them in a freezer-safe bag or container. They freeze well for up to 2 months.When you're ready to enjoy them, let the blondies thaw at room temperature or warm in the microwave for 10–15 seconds to bring back their soft, chewy texture. Avoid refrigerating, as it can cause them to dry out.