Good-Cooking - Blueberry Buckle Coffeecake

Ingredients

• 9-inch round pan or 9-inch square pan
• flour
• sugar
• shortening
• milk
• baking powder
• salt
• egg
• blueberries
• 1/2 cup granulated ugar
• 1/3 cup all purpose flour
• 1/2 teaspoon ground cinnamon
• 1/4 cup margarine or butter, softened
• 1/2 cup powdered sugar
• 1/4 teaspoon vanilla extract
• 1 to 2 teaspoons milk