1 1/2 cups all-purpose flour
1 1/2 teaspoons cinnamon
1 1/2 teaspoons baking powder
1/2 teaspoon baking soda
1/2 teaspoon salt
1/2 (1 stick) cup unsalted butter, at room temperature
1 cup sugar
2 eggs, at room temperature
1 teaspoon vanilla extract
1/2 cup milk, at room temperature

For Cinnamon Sugar
1/2 cup sugar
1 1/2 teaspoons cinnamon

For the Filling
3/4 cup dulce de leche
1/4 cup sour cream
1 cup heavy cream
8 ounces mascarpone cheese, room temperature
1/2 cup confectioners' sugar, sifted
1/4 tsp. cinnamon