Caramel Chews

2 sticks or 1/2 lb. butter or margarine
2 cups or 1 lb. brown sugar
2 cups chopped pecans
1 1/2 teaspoon baking powder
1 1/2 cups sifted flour
2 teaspoons vanilla extract
1 teaspoon butter flavoring (optional)
2 eggs

Melt butter or margarine, add brown sugar. Stir well until sugar is dissolved. Let cool. Add eggs and beat well. Add vanilla and butter flavoring, flour and baking powder (sifted together) and pecans. Mix well. Pour into well-greased-and-floured 10x15x1-inch sheet pan and bake at 325 degrees F for 40-45 minutes. Cool thoroughly and cut into 2-inch squares.