Fresh or frozen strawberries Or other fruit chunks Morning or afternoon before: line twelve 6 cm muffin tin cups with paper liners. In bowl, blend crumbs and melted butter. Press some of this crumb mixture to bottom and sides of each lined muffin tin cup; refrigerate for 1 hour. Meanwhile, with electric mixture at medium speed, beat sugar, eggs, cheese, and vanilla until smooth and creamy. Spoon this mixture into cups; fill each cup almost to top of crumb crust. Refrigerate till served. Just before serving: remove from pans, spread sour cream on each cupcake, then top with fruit.