Coffee Cake

Ingredients

• 2 1/4 cup gluten-free all purpose flour
• 1/2 cup granulated sugar
• 1 tbsp baking powder
• 1 tsp ground cinnamon
• 1/2 tsp xanthum gum
• 2 egg whites
• 3/4 cup sour cream
• 1/2 cup soymilk
• 1 tbsp canola oil
• 1/4 cup gluten-free all purpose flour
• 2 tbsp firmly packed light brown sugar
• 1 tsp ground cinnamon
• 2 tbsp chilled margarine, cut into small pieces