Preheat oven to 350° Fahrenheit.
Add oil, onion, garlic, and ground turkey to a large skillet. Cook for about 5-7 minutes, until onions are softened and ground turkey is browned.
Add all but one cup of the marinara sauce to the ground turkey mixture. Remove from heat.
While the turkey is cooking, in a separate bowl, mix together the egg, cottage cheese, parmesan cheese, parsley, pepper, and drained spinach. Set aside.
Spread one cup of the marinara sauce evenly to cover the bottom of a 9x11 baking dish coated with cooking spray.
Lay 4 lasagna noodles side by side, to cover the layer of sauce.
Spread cottage cheese mixture evenly over the noodles.
Top with half of the mozzarella.
When the meat sauce (ground turkey mixed with marinara) is ready, spread half of it out over the mozzarella layer.
Lay 4 lasagna noodles out side by side to cover the turkey mixture.
Top with remaining turkey mixture.
Sprinkle the remaining mozzarella cheese evenly over the meat sauce, as a top layer.
Bake in the oven at 350 degrees for 40 to 45 minutes. The sauce should be bubbling on the sides.
Let sit for five minutes to set before serving.