Step 1

Preheat oven to 375 F. degrees. Grease an 11x8" baking pan.

Step 2

In a medium sized saucepan, bring butter and water to boil.

Step 3

In a large mixing bowl, combine flour and sugar.

Step 4

Add in eggs, sour cream, vanilla, & baking soda. Slowly pour in the boiling butter/water mixture. Stir until smooth.

Step 5

Pour into greased baking pan.

Step 6

Make the filling by mixing brown sugar, butter and cinnamon together in a small bowl. Drop by the teaspoon full across the top of the cake batter, swirl with a butter knife.

Step 7

Bake at 375 F.degrees for 20-22 minutes or until golden brown & toothpick inserted in center comes out clean.

Step 8

Cool cake for 20 minutes.

Step 9

For Frosting: In a mixing bowl add butter, powdered sugar and vanilla together and use an electric mixer to whip until well mixing. Spread over cooled cake and serve.