Blueberry KÜchen (Cake)

I picked fresh blueberries (21 pounds) and made this  - and MANY blueberry-themed dishes. 
Read from my blog, BigCoffeeCup.com, about my adventures picking blueberries in Uruguay: 
​BLUEBERRY THANKSGIVING.
Cake Ingredients
1 & 1/2 cups all-purpose flour
3/4 cup sugar
2 teaspoons baking powder
1 &1/2 teaspoons grated lemon rind
1/2 teaspoon ground nutmeg
1/4 teaspoon salt
2/3 cup milk
1/4 cup melted butter 
1 egg, beaten slightly with a fork
1 teaspoon vanilla extract
2 cups blueberries, fresh or frozen
Topping Ingredients
3/4 cup sugar
1/2 cup all-purpose flour
1/4 cup melted butter
Picture
Steps
  1. Add first 6 ingredients to a large mixing bowl; stir to combine.
  2. Add the milk, butter, egg, and vanilla; using an electric mixer, beat for 2 minutes or until well blended.
  3. Pour the batter into a greased 13x9 inch baking pan.
  4. Sprinkle with blueberries or I just stir them into the batter before pouring it into the pan.
  5. Now make the topping by stirring together the sugar and flour. 
  6. Add the melted butter and stir with a fork until it's kind of crumbly.
  7. Sprinkle the crumbly topping over the blueberry mixture in the pan.
  8. Bake at 350° F for 35 - 40 minutes or until lightly browned.