Step 1

Preheat oven to 350 degrees.

Step 2

In a large skillet, brown beef until no longer pink. Drain meat and add the taco seasoning. Stir until combined and set aside.

Step 3

In a small bowl, add the egg and ricotta and stir until combined.

Step 4

In a 9x13 baking dish, start by layering 4 lasagna noodles on the bottom of the pan. Next, layer 1/3 of the ricotta, 1/3 of the beef mixture, 1/3 of the salsa, and 1/3 of the cheese. Repeat the layers 2 more times.

Step 5

Bake covered for 30-40 minutes or until the casserole has heated through and is bubbly. Let casserole stand 10 minutes before cutting. Top with sour cream, sliced green onions, and diced tomatoes if desired.