Caramel Brownies

1 (1 pound) box light brown sugar
3/4 cup butter or margarine
3 eggs
1 1/2 cups all-purpose flour
1 1/2 teaspoons baking powder
1 cup chopped pecans
2 teaspoons vanilla extract
Chocolate chips (optional)

Blend all ingredients. Pour into a 13 x 9-inch greased and floured baking dish. Bake for about 35 minutes at 325 degrees F.