01 -
Preheat oven as per box directions. Prepare the cake batter following package instructions, then mix in ground cinnamon and brown sugar. Pour into a greased 9×13-inch pan and bake until a toothpick inserted in the center comes out clean.
02 -
Let the cake cool for 10 minutes. Using the handle of a wooden spoon or spatula, create holes evenly across the top of the cake, spacing them about 1 inch apart.
03 -
Combine sweetened condensed milk, melted butter, brown sugar, and ground cinnamon. Pour the mixture into the holes while the cake is still slightly warm.
04 -
In a bowl, beat softened cream cheese and butter until smooth. Gradually add powdered sugar and vanilla extract, mixing until the frosting is fluffy and spreadable.
05 -
Spread the cream cheese frosting over the cake, ensuring it sinks into the holes. If you used the filling, chill the cake for 1 hour to set. Otherwise, slice and serve immediately.