Step 1

Bring a large pot of water to a boil and cook the lasagna noodles to al dente according to the instructions on the package. After pasta has cooked, place into a large bowl of cold water. Set aside.

Step 2

In a large skillet over medium-high heat, brown and crumble/break apart sausage and ground beef with a spatula or wooden spoon. Once meat has cooked through, add onion and garlic. Cook until onion has softened, about 5 minutes. Stir in the diced tomatoes. Remove skillet from heat and set aside.

Step 3

Preheat oven to 375 °F (191 °C) and lightly grease a 9x13-inch oven-safe casserole dish. Set aside.

Step 4

In a medium bowl, stir together marinara sauce, dried oregano, dried basil, crushed red pepper flakes, salt, and pepper.

Step 5

In a small bowl, whisk together ricotta and egg. Set aside.

Step 6

To assemble your lasagna, remove the lasagna noodles from the water and pat them dry.

Step 7

In the bottom of the casserole dish, add a thin layer of marinara sauce then place 3 lasagna noodles on top. Spread a little bit of the ricotta evenly on the noodles then add a layer of marina sauce and fianlly add a layer of the meat mixture on top. Sprinkle 1/3 of the mozzarella cheese on top of the meat mixture. Repeat the layers 2 more times, ending with the cheese layer sprinkled on top.

Step 8

Lightly spray the bottom side of the foil and cover casserole tightly with foil.

Step 9

Bake for 25 minutes then remove foil and bake for another 10 minutes.

Step 10

Cut into squares and serve.