Orange-Blueberry Streusel Cake(Low-Fat)  
["1/4 c. sugar", "2 Tbsp. all-purpose flour", "2 tsp. grated fresh orange rind", "1/2 tsp. ground cinnamon", "1 Tbsp. margarine", "1 (16.5 oz.) box light, 97% fat-free wild blueberry muffin mix", "3/4 c. fresh orange juice", "1 tsp. vanilla extract", "1 egg white", "vegetable cooking spray"]
["Combine sugar and next 3 ingredients in a bowl; cut in margarine with a pastry blender until mixture resembles coarse meal.", "Set aside.", "Remove blueberries from muffin mix box.", "Drain and rinse blueberries and set aside.", "Combine muffin mix and next 3 ingredients in a bowl, stirring just until dry ingredients are moistened.", "Gently fold in blueberries.", "Pour batter into an 8-inch square baking dish coated with cooking spray.", "Sprinkle sugar mixture over batter.", "Bake at 400\u00b0 for 25 minutes or until a wooden pick inserted in center comes out clean.", "Cool in pan on a wire rack.", "Yield:", "12 servings.", "Serving size 1 (2 1/2 x 2-inch) piece.", "Per serving:", "2 grams fat and 129 calories.", "Preparation time:", "9 minutes.", "Cooking time:", "25 minutes."]
["sugar", "flour", "orange rind", "ground cinnamon", "margarine", "light", "orange juice", "vanilla extract", "egg", "vegetable cooking spray"]