Preheat oven to 425°. In a large skillet heat oil over medium heat. Cook beef, sausage, onion and garlic until no longer pink, 6-8 minutes, breaking into crumbles; drain, return to pan. Stir in pasta sauce; heat through., Spread 1 cup sauce into a greased 13x9-in. baking dish. Layer with half of the sliced chicken, half of the sliced pepperoni, 2 cups sauce and half of each cheese. Repeat layers., Bake, covered, 25 minutes. Uncover; bake until cheese is browned and lasagna is bubbling, 20-25 minutes longer. Let stand 15 minutes before serving.