Preheat the oven to 375 degrees. Bring a large pot of water to boil, add the lasagna sheets and cook per the package instructions until al dente. In a large skillet over medium-high heat, add the olive oil and diced onions. Allow onions to cook for 3-4 minutes to soften then add in the Italian sausage and ground beef. Cook until no pink is visible then add in the minced garlic and cook for an additional minute. Drain off any grease and season with seasoned salt, onion powder, garlic powder, and Italian seasoning. Add in the Marinara sauce and stir until well combined.

In a small mixing bowl, crack the egg and whisk. Add in the Ricotta cheese, ½ cup mozzarella cheese, ½ cup parmesan cheese, and dried parsley. Then stir until well combined.

In a 9x13 baking dish place down a thin layer of meat sauce, then layer 2-3 cooked lasagna sheets (whatever fills your baking dish) then place a thin layer or the ricotta mixture. Repeat steps until baking dish is full and all ingredients are used up. Be sure to finish the layers with a meat sauce layer and sprinkle 1 cup of mozzarella cheese and ½ cup parmesan cheese on top.

Cover with aluminum foil and bake at 375 degrees for 35 minutes then remove the cover and bake for an additional 10 minutes until cheese is slightly golden and bubbly. Let rest for 10-15 minutes then serve & enjoy!