Preheat your oven to 350 F.
Brown the Italian sausage in a medium skillet over medium-high heat until cooked through. Drain excess fat.
In a medium mixing bowl, stir together ricotta cheese, egg, parmesan cheese, parsley, and basil until well combined.
Spread 1/4 cup of marinara sauce at the bottom of a 9 x 13" baking pan. Place three oven-ready noodles on top.
Top the noodles with one-fourth of the ricotta mixture, one-fourth of the browned sausage, and half a cup of marinara sauce. Add half a cup of shredded Italian-blend cheese on top.
Add three more lasagna sheets followed by another one-fourth portion each of ricotta mixture and sausage along with one cup of Alfredo sauce. Sprinkle another half cup of shredded cheese.
Continue layering until all ingredients are used, topping the last noodles with one cup of marinara sauce. Cover tightly with foil.
Bake in the preheated oven for about 45 minutes. Remove foil and top with slices of fresh mozzarella. Bake for another 15–20 minutes until melted and bubbling.
Let the lasagna cool for 20–25 minutes before slicing.