The most extraordinary moist Cinnamon Apple Cake made by preheating oven to 350°F greasing and lining two 9-inch pans whisking 2 1/2 cups flour 1 1/2 cups packed brown sugar 2 tsp baking powder 1 tsp baking soda 1/2 tsp salt 2 tsp cinnamon 1/2 tsp nutmeg and optional 1/4 tsp allspice whisking 3 room temperature eggs 1 cup oil 2 tsp vanilla and 1/2 cup room temperature sour cream until smooth adding 3 cups grated fresh apple stirring combined folding wet into dry just combined batter will be thick dividing between pans baking 30 to 35 minutes until toothpick clean cooling 10 minutes then on racks completely then beating 16 oz room temperature cream cheese and 1/2 cup room temperature butter smooth adding 4 to 5 cups sifted powdered sugar vanilla 1/2 tsp cinnamon and salt beating fluffy assembling with frosting between and over layers. A completely perfect grated apple brown sugar cinnamon cream cheese frosting fall cake recipe.