Icelandic Happy Marriage Cake - cooking recipe

Ingredients

1 cup quick oatmeal
1 cup all-purpose flour
1/2 cup brown sugar
1/2 cup white sugar
1 teaspoon baking soda
1 cup unsalted butter (at room temperature)
1 egg
1 teaspoon vanilla extract
3/4 cup rhubarb jam

Preparation

Preheat oven to 400\u00b0. Butter or grease a 9-inch cake or pie pan.
In a mixing bowl, combine oatmeal, flour, brown and white sugar, and baking soda. Cut in the butter (as you would for pie crust); with a pastry blender or with your hands, rub the butter into the dry ingredients until well blended.
Beat in one egg and vanilla extract.
Press 2/3 of the cake dough into the bottom of the pan. Spread the rhubarb jam evenly over the layer, then crumble remaining dough over top of cake.
Bake for 20-25 minutes, or until crust is golden brown.
Cool in pan on wire rack.
Slice and serve.