Oatmeal Cake

This Swedish recipe for oatmeal cake has an oatmeal topping. Here's the recipe:

7 tablespoons melted butter
1 cup sugar
3 cups flour
4 teaspoons baking powder
1 1/4 cups milk
1 teaspoon cardamom
1 teaspoon vanilla sugar

Topping:

3 1/2 tablespoons melted butter
1/2 cup sugar
3/4 cup oatmeal
1 teaspoon cinnamon

Mix all the cake ingredients.
Coat a pan with butter and breadcrumbs.
Pour the batter into the pan.
Mix the ingredients for the topping and spread over the batter.
Bake at 200 degrees Celsius for about 20 minutes or until golden brown.