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In a bowl whisk together
1 ½ cups flour
1 ½ tsp. double acting baking powder
Pinch of salt
Set aside
In another bowl, stir together
1 cup sour cream
1 tsp. baking soda
Set aside
In a large bowl, cream together
1 stick (½ cup) butter, softened
1 cup sugar
until light and fluffy. Add 2 eggs - 1 at a time, beating well after each one. Beat in 1 tsp. vanilla.
Stir in four mixture and sour cream mixture alternately to batter until well combined.
Pour batter into buttered 10" round cake pan.
Mix together
1/3 cup sugar
1/3 cup brown sugar
1 tsp. cinnamon
Pour sugar mixture over top of batter and swirl into batter. Bake at 350F for 45 to 50 minutes or until tester comes out clean.