Baked Ziti

Name: Baked Ziti
Prep time: 15 min
Cook time: 45 min
Total time: 1 h
Cuisine: European, Italian, Mediterranean
Ingredients: 2 tbsp. olive oil; 1 whole large onion, diced; 3 cloves garlic, minced; 1 lb. Italian sausage; 1 lb. ground beef; 1 (28-oz.) can whole tomatoes, with juice; 2 (14.5-oz.) cans tomato sauce or marinara sauce; 2 tsp. Italian seasoning; 1/2 tsp. red pepper flakes; Kosher salt, to taste; Ground black pepper, to taste; 16 oz. ziti or mostaccioli, cooked until not quite al dente; 15 oz. whole milk ricotta cheese; 1 1/2 lb. mozzarella cheese, grated and divided; 1/2 c. grated parmesan cheese; 1 egg; Freshly chopped parsley