Step 1

Preheat oven to 350°F. To easily remove the cake from the pan and reduce possible crumbs, put a circular piece of parchment at the bottom of the pan.  You can trace the pan on the parchment and then cut it out and place it inside the pan the two 9-inch round baking pans and then spray non-stick baking spray. Set aside.

Step 2

In a medium bowl, mix flour, baking powder, baking soda, salt and ground cinnamon. Set aside.

Step 3

In a large bowl, using an electric or stand mixer on medium speed, beat eggs and sugar for about 2 minutes, or until light and creamy. Add the butter and vanilla extract and beat on low speed for about 1 minute, or until well blended. Beat in the dry ingredients on low speed until blended. DO NOT OVER MIX! Add the sour cream and beat until smooth.

Step 4

Divide batter evenly into prepared baking pans. Bake 18 to 20 minutes or until toothpick inserted in center comes out clean. Allow cake to cool before frosting.

Step 5

Mix softened butter on medium speed with an electric or stand mixer. Beat for 30 seconds until smooth and creamy.

Step 6

Add powdered sugar, milk, ground cinnamon and vanilla extract. Increase to high speed and beat for 3 minutes or until smooth.

Step 7

Spread the frosting between layers and over top and sides of cake. Sprinkle with cinnamon-sugar.