Blondies are simply brownies without the chocolate. A light-colored metal pan is your best bet for even baking and cakey, moist blondies.
Serves 16 (serving size: 1 blondie)
1. Preheat oven to 350°.
2. Place butter, oil, and sugar in a small saucepan; bring to a boil. Cook 1 minute, stirring constantly. Pour mixture into a large bowl; cool 8 minutes. Stir in vanilla and eggs.
3. Weigh or lightly spoon flour into dry measuring cups; level with a knife. Combine flour, baking powder, and salt in a bowl; stir with a whisk. Add flour mixture to butter mixture; stir until completely combined. Stir butterscotch morsels into flour and butter mixture.
4. Scrape mixture into an 8-inch square light-colored metal baking pan coated with baking spray. Smooth top. Bake at 350° for 24 minutes. Cool completely in pan on a wire rack. Cut into 16 squares.