Kandy Evans

For the Cake: - 1 cup (2 sticks) unsalted butter, softened - 1 1/2 cups granulated sugar - 4 large eggs - 1 tsp vanilla extract - 3 cups all-purpose flour - 1 tsp baking powder - 1/2 tsp salt - 1 cup sour cream or buttermilk For the Cinnamon Swirl: - 1/4 cup brown sugar, packed - 1 tbs