• Preheat oven to 350-degrees. Spray a 9" x 13" cake pan with non-stick spray.

Cake

• In a medium-sized bowl, combine the flour, baking soda, baking powder, and salt. Set aside.
• In a large bowl, combine the butter, sugar, vanilla, eggs, and sour cream. Mix until combined well.
• Slowly add the flour mixture and blend well.
• Add half of the mixture to the cake pan.

Filling

• In a medium-sized bowl, add the cream cheese, vanilla, sugar, and egg. Mix until blended.
• Add spoonfuls of the mixture on top of the cake batter.
• Spread the remaining cake batter on top of the cream cheese mixture.
• Take a knife and marble it through the mixture.

Topping

• Mix the butter, sugar, and flour together with a fork, until it is in small crumbles.
• Place it on top of the cake and cream cheese.
• Cook for approximately 45-minutes, or until knife comes out clean.

Glaze

• Mix the powdered sugar and the milk until you get a creamy glaze. You can add as much powdered sugar or milk as needed. It should reach a semi-runny consistency.
• Pour over the cake after it has cooled.