A cream cheese filling recipe rated 4.5 out of 5 stars, as of 2015, by 36 reviewers on Wilton.com calls for beating one 8-ounce package softened cream cheese, 1/2 cup confectioner's sugar and 1/4 cup milk until mixed well. Refrigerate until ready for use.
One reviewer on Wilton.com reported that the cream cheese filling was not as sweet as expected, but more sugar can be added to make the mixture thicker if desired. Another reviewer used the filling to make a chocolate cream cheese pie by placing the filling at the bottom of a graham cracker pie crust and topping it with chocolate pudding and whipped cream. One recommendation is to use the filling as a dip for vanilla wafers or as a filling for cupcakes, including pumpkin, banana, chocolate or red velvet flavors. A few reviewers suggested using a big enough icing tip to ensure that enough filling goes into the cupcakes.
Another cream cheese filling recipe on BettyCrocker.com can double as a frosting for the top of cupcakes. Beat 12 ounces softened cream cheese, 1/3 cup softened butter and 1 teaspoon vanilla on high. Slowly beat in 9 cups powdered sugar until smooth, and then beat in 1 tablespoon milk. Add more milk, 1 teaspoon at a time, until filling is the desired texture.