Lingonberry Cake

Ingredients
Cake:


 * 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

Streusel topping:


 * 1 1/2 dl (2/3 cup) oatmeal
 * 3 tablespoons butter
 * 1 dl (1/2 cup) sugar
 * 1 teaspoon vanilla sugar

Directions
Preheat the oven to 200 degrees C. Combine flour, sugar, and baking powder then cut in the butter with pastry blender. Add the egg and mix. Spread into a greased pan. Spread the preserves over the batter. Bake 25-30 minutes. Cool in the pan.