Combine cream cheese, powdered sugar and 1 teaspoon cinnamon in a medium-sized bowl. Beat with a whisk or silicone spatula until the mixture is light, fluffy and no longer lumpy, 2 to 3 minutes. (You could also use an electric mixer.)
In a separate bowl, combine remaining cinnamon, melted butter and sugar. Mix to combine. Pour this mixture into the cream cheese batter, folding it in just enough to create cinnamon-sugar swirls in the dip.
Serve with graham crackers, apple slices or whatever you'd prefer.
