White chocolate chips and walnuts are stirred into the batter and sprinkled on top of these butterscotch brownies.
Heat oven to 350°F. Line two 9 x 9 x 2-inch square baking pans with foil, extending over two sides.
Mix together flour, baking powder and salt in a bowl. Beat butter, sugar, vanilla in large bowl until creamy. Beat in eggs, one at a time. On low, beat in flour mixture. Stir in 2 cups walnuts and 1 cup chips. Divide batter into pans. Divide remaining nuts in half; sprinkle over each pan.
Bake in 350°F oven 40 minutes, until toothpick tests clean. Remove pans from oven. Sprinkle tops with remaining chips; lightly press down chips with spatula to melt slightly. Cool in pan on rack. Cut in squares.