Step #7 In another bowl stir this together ricotta, egg, salt & pepper.
Step #8 Grate mozzarella.
Step #9 Pour 1 c sauce into a baking dish, & cover with 3 lasagne sheets, 13 by 9 by 2-inches (sauce will not cover bottom completely), making sure they do not touch each other.
Step #10 Spread about 2 c sauce over pasta.
Step #11 Drop 1/3 of ricotta mixture by spoonfuls onto sauce & carefully spread with back of spoon.
Step #12 Sprinkle top 1/4 of mozzarella over ricotta mixture.
Step #13 Make 2 more layers in the same manner, beginning & ending with pasta.
Step #14 Spread remaining sauce evenly over top, making sure pasta is completely covered, & sprinkle with Parmesan & remaining mozzarella.
Step #15 Cover up dish tightly with foil wrap, tenting slightly to prevent foil wrap from touching top layer, & bake in middle of oven for 20 mins.
Step #16 Remove foil wrap & bake lasagne 10 mins more, or until top is bubbling & golden.
Step #17 Let lasagne stand 5 mins before serving.
Enjoy the Sausage, Ricotta & Mozarella Lasagne recipe