My son decided to do his own version of homemade lasagna, remembering a time that I had made it when he was little (mine came out of the Better Homes and Garden cookbook from the '70's). He is a great cook and came up with this recipe, then posted it on his facebook page. A lot of people, me included, begged him for a written recipe, which he finally wrote up.
In a sauce pan, cook the sausage until no longer pink. Add the onion and garlic; saute for another 4 minutes. Add pasta sauce to the mixture and set aside.
In a medium bowl, blend ricotta cheese, egg, 1/4 cup Parmesan cheese and chopped spinach; set aside.
Coat a 9x13 baking dish with the olive oil. Spread 1 cup of sauce mix on the bottom. Top with 3 of the uncooked lasagna noodles. Don't worry, they will soak up liquid when you place the dish in the oven.
Spread 1/4 of the ricotta cheese mix on the noodles and layer on 1 cup of the sauce mix.
Sprinkle 1/2 cup mozzarella on top. Lightly sprinkle Italian seasoning on top.
Repeat the steps 3 more times. Sprinkle with oregano.
Preheat oven to 350 degrees and bake for 45 minutes until hot, bubbly, and awesome. Let stand for 10 minutes before slicing. Enjoy