Preheat oven to 350˚F , grease and line two 8" round cake pans. In a large bowl, sift flour, baking powder, add salt and cinnamon. Mix well with a large spoon or spatula. Set aside.
In another large bowl, add butter and sugar. Using an electric hand mixer, beat at high speed until light and creamy.
Add eggs one at a time and beat at low speed while adding, add vanilla extract.
Add 1/2 of the dry ingredients to the mixture; beat at low speed until thoroughly combined.
Slowly add milk and beat on low speed while adding.
Add the other half of the dry ingredients and beat on low speed until thoroughly combined.
Pour your batter into the lined baking pans.
Divide between 2 round cake pans and bake at 350˚F for 30-35 minutes or until a toothpick comes out clean. Allow the cakes to cool in pans for 10 minutes, then transfer to a wire rack.