Sour Cream Coffee Cake

Batter
1 cup butter
2 cups white sugar
2 eggs
1 cup sour cream
1/2 teaspoon vanilla extract
2 cups all-purpose flour
1 teaspoon baking powder
1/8 teaspoon salt

Filling

1/3 cup all-purpose flour
1/2 cup packed brown sugar
2 tablespoons melted butter
1 teaspoon ground cinnamon

Heat oven to 350°. Grease a tube pan.

In a large bowl, cream together 1 cup butter and white sugar until light and fluffy.  Beat in the eggs, one at a time, then stir in the sour cream and vanilla.  Mix in 2 cups flour, baking powder, and salt.  Spread half the batter in the prepared pan.

Prepare the filling: In a medium bowl mix 1/3 cup flour, brown sugar, 2 tablespoons melted butter, and cinnamon.  Sprinkle cake batter with half the filling.  Spread second half of batter over the filling, and top with remaining filling.

Bake 50 to 60 minutes in the preheated oven, or until a toothpick inserted near the center comes out clean.