Dice bell pepper and onion.

Brown sausage and hamburger in a large pan.

Add garlic to the meat mixture and cook until fragrant.

Drain excess fat from the meat mixture.

In a separate pot, combine tomato sauce, tomato paste, and Italian seasoning.

Simmer the tomato sauce mixture over low heat.

Cook lasagna noodles according to package directions, but do not overcook.

Set cooked noodles aside.

Preheat oven to 350°F (175°C).

In a 9x13 inch baking pan, layer noodles, meat sauce mixture, a thin layer of ricotta cheese, and mozzarella cheese.

Repeat the layers of noodles, meat sauce, ricotta, and mozzarella until all ingredients are used.

For the top layer, place ricotta cheese next to the noodles and meat mixture.

Cover the top layer with mozzarella cheese and a thin layer of Parmesan cheese.

Bake in the preheated oven for approximately 60 minutes, or until golden brown and bubbly.