Put all of the dry ingredients in a large bowl.
Add all of the liquid ingredients.
Mix until just smooth.
Spray two 8-inch pans with cooking spray. Put a piece of parchment on the bottom of the pan and spray again.
Pour the batter into the cake pans. Bake in a preheated 350-degree oven for about 45 minutes, or until a toothpick comes out clean.
Let the cakes cool in the pans for 10 minutes. Turn them out and let cool completely.
Make the frosting. Whip the heavy cream until stiff peaks form. In another bowl, whisk together the mascarpone, cinnamon, vanilla, salt, and sugar. Gently fold the whipped cream into the cheese mixture.
Use half of the frosting and cover the top of your cake. Repeat with the other layer.
Sprinkle cinnamon on top for garnish.