Blueberry Breakfast Cake

Directions

1. 1
   Preheat the oven to 400 degrees F. Coat an 8-inch square baking pan with nonstick cooking spray.
2. 2
   In a large mixing bowl, whisk together the egg, milk, yogurt, and butter.
3. 3
   In a separate bowl, mix the oat flour, whole wheat flour, all-purpose flour, sugar, baking powder, and salt.
4. 4
   Sift the dry ingredients into the wet ingredients.
5. 5
   Stir the barter just to blend.
6. 6
   Do not overbear.
7. 7
   Fold in the blueberries and transfer the batter to the prepared pan.
8. 8
   For the topping, in a small bowl, stir together the sugar, walnuts, and cinnamon.
9. 9
   Sprinkle over the batter.
10. 10
    Bake for 20 to 25 minutes, or until the top is golden brown and a knife inserted into the center of the cake comes out clean.
11. 11
    Cool on a rack for 10 minutes.
12. 12
    Cut into 9 squares and serve warm.