Preheat oven to 350°F. Grease three 9-inch cake pans.
Whisk dry ingredients.
Cream butter and sugar until fluffy (5 min).
Add eggs one at a time, then vanilla.
Alternate adding dry ingredients and milk.
Divide batter between pans.
Bake 25-30 minutes until done.
Cool completely.
Beat drained ricotta until smooth.
Add sugar, vanilla, cinnamon to ricotta.
Fold in chocolate chips.
Layer cake with filling.
Cover sides with chocolate chips.
Top with shells and dust with sugar.