Blueberry Breakfast Cake

Directions

1. 1
   In a bowl, combine flour, sugar and baking powder.
2. 2
   Add egg, milk, butter and lemon zest; mix just until dry ingredients are moistened. Fold in the blueberries.
3. 3
   Spread in a greased 9-in. square baking pan. For topping, combine sugar, flour, walnuts and cinnamon.
4. 4
   Cut in butter until mixture is crumbly.
5. 5
   Sprinkle over batter.
6. 6
   Bake at 350° for 40-45 minutes or until cake tests done.