The Final Mix My Homemade Blueberry Coffee Cake Plus A Baking Tip!

1/2 cup packed brown sugar
1/2 cup chopped pecans
1 1/2 teaspoons ground cinnamon
Coffee Cake
3 cups Gold Medal™ all-purpose or whole wheat flour
1 1/2 teaspoons baking powder
1 1/2 teaspoons baking soda
3/4 teaspoon salt
1 1/2 cups granulated sugar
3/4 cup butter or margarine, softened
1 1/2 teaspoons vanilla
3 eggs
1 1/2 cups sour cream
Light Brown Glaze
1/4 cup butter
2 cups powdered sugar
1 teaspoon vanilla