Lingonberry Cake

Ingredients
Cake: Streusel topping:
 * 4 1/2 dl (scant 2 cups) flour
 * 1 1/2 dl (2/3 cup) Sugar
 * 1 tablespoon baking powder
 * 150 g (5 ounces, scant 2/3 cup)
 * unsalted butter
 * 1 egg
 * 2 dl (3/4 cup) lingonberry preserves
 * 1 1/2 dl (2/3 cup) oatmeal
 * 3 tablespoons butter
 * 1 dl (1/2 cup) Sugar
 * 1 teaspoon vanilla Sugar

Directions

 * 1) Preheat the oven to 200 degrees C.
 * 2) Combine flour, Sugar, and baking powder then cut in the butter with pastry blender.
 * 3) Add the egg and mix.
 * 4) Spread into a greased pan.
 * 5) Spread the preserves over the batter.
 * 6) Bake 25–30 minutes.
 * 7) Cool in the pan.