Orange-Blueberry Streusel Cake - cooking recipe

Ingredients

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

Preparation

Combine sugar and next 3 ingredients in a bowl; cut in margarine with a pastry blender until mixture resembles coarse meal.
Set aside.