Preheat the oven to 350℉/180℃. Grease an 8×8 inch square pan. For easy removal of the blondies, place parchment paper on the bottom and 2 sides of the pan. Grease again and then set side.
Melt the butter. As it cools, prep and measure the rest of your ingredients.
1/2 cup butter
In a large bowl, whisk together the slightly cooled melted butter and white sugar until well combined. You may use a whisk, or an electric mixer.
3/4 cups white sugar
Add in peanut butter and continue whisking.
1/2 cup peanut butter
Add in egg, egg yolk, and vanilla. Continue to whisk until well combined.
1 egg, 1 egg yolk, 2 tbsp vanilla
Toss in the flour and baking powder. Once it is almost completely mixed in, add the pretzels and chocolate chips and continue mixing until there is a soft dough.
1 cup all-purpose flour, 1/2 tsp baking powder, 1/2 cup semi-sweet chocolate chips, 1/2 cup chopped pretzels
Evenly press the dough into the prepared pan.
Gently press more pretzels, chocolate chips, and globs of peanut butter on top of the blondies. This is optional.
2 tbsp peanut butter
Bake for 24-27 minutes. Mine took exactly 25 minutes.
Cool, slice, and enjoy!