Instructions:

Preheat oven to 400 degrees. Grease a 9x13 baking dish with 1 tablespoon oil. Set aside.

In a large skillet on medium high heat, add 2 tablespoons oil. Brown meat until no longer pink. Remove from heat, drain any excess grease and let cool.

In a greased baking dish, stir together tomato sauce, chicken stock, 1 cup mozzarella, parmesan, tomato paste and browned beef. Stir in penne pasta. Cover with foil. Bake for 50-55 minutes, stir several times during cooking.  Remove foil, sprinkle with remaining mozzarella and bake for another 5-8 minutes. Serve.