Vegetarian Fast and Fancy

1 cup butter, softened
2 cups brown sugar
1/2 cup sour cream
2 teaspoons vanilla
2 cups flour
1 teaspoon baking powder
3/4 cup chopped walnuts
1 cup butterscotch chips
1/2 cup semisweet chocolate chips

In large bowl, beat together butter, sugar, sour cream and vanilla until blended. Mix together the remaining ingredients and stir into the butter mixture until blended; do not overmix. Spread batter evenly into a greased 10x15 inch nonstick baking pan and bake at 325F for about 30 minutes, or until top is browned. Allow to cool in pan. When cool, cut into 1 1/2 inch squares to serve. Can sprinkle with sifted powdered sugar as well.