Preheat oven to 350°F. Line a 9-by-13-inch baking pan with parchment.
In a bowl, mix flour, baking powder and salt. Using an electric mixer, beat butter and sugar until light. Beat in eggs, one at a time, then vanilla. Reduce speed to low; beat in flour mixture. Stir in chocolate chips and 1 cup pretzels. Spread evenly in baking pan. Bake until a toothpick inserted into center comes out clean, 25 to 30 minutes.
In a bowl set over a pan of simmering water, melt chocolate with peanut butter, stirring until smooth. Spread mixture evenly over blondies. Sprinkle with remaining crushed pretzels. Let cool before cutting into squares.
Also appeared in:
All You, None, 2014,Get Ready for Summer Special