Preheat the oven to 375 degrees. Spread a ½ cup of marinara sauce into the bottom of a 13x9 pan and set aside.
Cook lasagna noodles in a large pot adding 2 teaspoons of salt to the water. Cook according to directions while making the meat sauce.
In a frying pan, add 1 tablespoon olive oil and sausage; cook on medium heat, breaking and stirring often to make a small crumble until cooked through about 10 minutes. Drain grease and set aside.
To the pan add the 1 tablespoon olive oil and onion and saute, until onions just start to brown; about 5 minutes. Add garlic and cook for 30 seconds, then return the meat back to the pan.
Mix in the remaining marinara sauce, and heat on medium low for 5 minutes.
In a large bowl, mix together ricotta cheese, 1 ½ cups mozzarella, parmesan, parsley, egg, ½ teaspoon salt and pepper.
Lay noodles out on a clean surface like a large cutting board. Scoop 3 tablespoons of cheese filling onto each noodle and spread evenly. Next, spread 2 tablespoons of meat mixture over the cheese filling.
Roll up noodles gently and place seam side down into the 13x9 pan.
Spoon over lasagna roll ups with remaining meat sauce and sprinkle with 1 cup of mozzarella cheese.
Cover with aluminum foil (sprayed with oil to prevent sticking). Bake for 45 minutes, until bubbly around the edges. Uncover and bake for 5 minutes. Serve warm and garnish with chopped parsley, if desired.