1/4 lb. (1 stick) butter
1/2 lb. prosciutto, minced
2 c. tomato sauce
1 lb. pasta
1 1/2 c. grated Parmesan cheese
1/2 lb. Mozzarella, in 1/2" pieces

Melt the butter and lightly cook the prosciutto. Add the tomato sauce and simmer, covered, while the pasta cooks.