Brown and drain fat from ground turkey.
Meanwhile, thaw frozen spinach in microwave or in a pan of hot water on stove. Drain excess water.
Meanwhile, in a medium mixing bowl combine ricotta cheese, egg, parmesan cheese, dried parsley, garlic powder, and 4 oz of shredded mozzarella cheese.
Add drained and thawed spinach to pan with drained and browned turkey. Add in pasta sauce, water, and dried oregano. Stir and heat through. (Note: Add water to pasta sauce jar first and shake to get remaining pasta sauce out.)
Spread 1 cup of spinach meat sauce onto bottom of 9 x 13 pan.
Add 3 lasagna noodles. Use back of spoon to spread 1/3 of the ricotta cheese mixture over the dry noodles. Spread 1 cup of spinach meat sauce over the ricotta cheese mixture.
Repeat previous step two more times.
Top with remaining 3 lasagna noodles.
Lightly grease a sheet of aluminum foil and put oil-side down over lasagna and seal tightly.
Bake at 350°F for 45 minutes.
Remove foil and bake for an additional 15 minutes.
Remove from oven and let sit for 15 minutes before cutting and serving.