Preheat your oven to 375°F (190°C).
Cook the lasagna noodle in boiling water until al dente, then drain and set aside.
In a non-stick skillet over medium heat, brown the ground turkey with the diced onion and minced garlic until the meat is fully cooked.
Stir in the tomato sauce, dried oregano, sea salt, and black pepper, allowing it to simmer for 5 minutes.
Add the fresh baby spinach to the sauce and stir until just wilted.
In a small bowl, mix the low-fat ricotta cheese with half of the grated parmesan cheese.
In a small oven-safe baking dish, spread a thin layer of the meat sauce on the bottom.
Layer half of the lasagna noodle (broken to fit the dish), the ricotta mixture, and half of the remaining meat sauce.
Top with the remaining lasagna noodle, the rest of the meat sauce, mozzarella cheese, and the remaining parmesan.
Bake for 15-20 minutes until the cheese is melted and the sauce is bubbling.