A delicious single serve coffee cake that can be enjoyed alone or shared. The cake is topped with a streusel and optional icing, making it perfect for a quick snack or dessert.
1: Preheat the oven to 350°F.
2: In a small bowl, combine egg, milk, sugar, vanilla, sour cream, and melted butter; mix until well combined. Then add flour and baking powder; mix until smooth.
3: For the streusel, add softened butter, flour, brown sugar, and cinnamon to a small bowl; mix lightly until crumbly.
4: Spray a small baking dish with oil; add half of the cake batter. Then top with half of the streusel and repeat.
5: Bake for 25 minutes or until a fork inserted comes out with soft crumbs.
6: Let it cool, top with icing if desired, and enjoy.
