Preheat your oven to 350°F. Line a 9x13-inch baking pan with parchment paper and lightly grease.
In a mixing bowl, blend your melted butter, creamy peanut butter, and brown sugar together until smooth.
Whisk the eggs into the mixture one at a time, beating gently until fully incorporated.
Softly fold in the salt, flour, and baking powder using a spatula, mixing just until combined. Fold in the white chocolate chips and peanut butter chips.
Spread the batter evenly into your lined pan. Sprinkle a few extra chips over the top if desired.
Bake uncovered for 15 minutes. Cover the pan with foil to prevent over-browning and bake for another 15 to 18 minutes until the edges are lightly golden.
Let your blondies cool completely in the pan to set their chewy texture before slicing.
Notes
Nutrition (Per Serving): Calories: 315 | Total Carbs: 51g | Net Carbs: 50g | Fats: 17g | Protein: 6.5g