Step 1

1 Preheat oven to 425°F (220°C).

Step 2

2 Warm the olive oil in a Dutch oven, over medium heat. Add the onion and garlic, and cook until slightly tender and fragrant.

Step 3

3 Add the sausage and ground beef, and cook until the meat is browned. Stir in marinara sauce, and simmer over medium-low heat.

Step 4

4 In a mixing bowl, combine the ricotta cheese with egg and salt.

Step 5

5 To assemble, spread half of the meat sauce in the bottom of a 9 × 13" (20 x 30 cm) baking dish. Follow with layers of chicken breast slices, ricotta mixture, mozzarella-cheese slices, and parmesan.

Step 6

6 Repeat the layers until you have used up all the ingredients, finishing with a final layer of mozzarella and Parmesan cheese.

Step 7

7 Bake for 25 minutes. Remove foil and bake an additional 25 minutes. Let cool for 15 minutes before serving.