For the Cinnamon Filling:
1 cup (2 sticks) unsalted butter, softened
1 cup brown sugar, packed
2 tablespoons all-purpose flour
1 tablespoon ground cinnamon
For the Cream Cheese Frosting:
4 oz cream cheese, softened
1/4 cup (1/2 stick) unsalted butter, softened
2 cups powdered sugar
1 teaspoon pure vanilla extract
2-3 tablespoons milk (adjust to desired consistency)
