Preheat your oven to 375°F (190°C).
Cook the lasagna noodles in boiling water until al dente, then drain and set aside.
In a skillet over medium heat, add the olive oil and brown the ground beef until fully cooked.
Season the beef with garlic powder, dried oregano, sea salt, and black pepper.
Add the baby spinach to the skillet and sauté until just wilted.
In a small bowl, stir the ricotta cheese until smooth and creamy.
In a small oven-safe baking dish, spread a thin layer of marinara sauce on the bottom.
Layer with half a noodle, half the beef and spinach mixture, a dollop of ricotta, and more sauce.
Repeat the layers until all ingredients are used, finishing with a final layer of sauce.
Sprinkle the shredded mozzarella and grated parmesan over the top.
Bake for 20 minutes until the cheese is melted and the edges are bubbling.