Bar Butterscotch Brownie Recipe Butterscotch Brownies Ingredients 1/4 cup butter 1 cup packed brown sugar 1 teaspoon vanilla 1 egg 3/4 cup all purpose flour 1/2 cup chopped walnuts 1 teaspoon baking powder 1/4 teaspoon salt Steps. 1. Heat oven to 350F 2. Grease square 8"*8"*2" pan. 3. Melt butter in microvwave and add brown sugar, vanilla and egg. 4. Stir in remiaing ingredients. 5. Spread in pan and bake 25 minutes. 6. Cut into squares while still warm.