Preheat oven to 350 degrees. Remove cheese from box and unwrap; discard plastic and lid. Slice off entire top rind. Return cheese to box and place on a baking sheet. Stick rosemary sprigs into cheese; bake just until cheese is melting, about 10 minutes.
Meanwhile, finely chop bacon, pine nuts, and rosemary leaves. Serve cheese immediately, with crostini and bacon mixture.