Preheat your oven to 375°F.
Cook the 2 sheets of whole wheat lasagna noodles in boiling water according to package directions until al dente, then drain and set aside.
In a medium skillet over medium heat, add 1 tsp olive oil and brown the 5 oz of ground beef until fully cooked.
Season the beef with 0.25 tsp sea salt, 0.25 tsp black pepper, 0.25 tsp garlic powder, and 0.25 tsp dried oregano.
Add 1 cup of fresh spinach to the skillet and stir until just wilted, then remove from heat.
In a small individual-sized baking dish, spread 2 tablespoons of the marinara sauce across the bottom.
Layer one-third of the cooked noodles (cut to fit the dish) followed by half of the beef and spinach mixture, 1.5 tbsp of ricotta, and a drizzle of marinara.
Repeat the layer with noodles, the remaining beef mixture, the remaining 1.5 tbsp of ricotta, and more marinara.
Top with the final piece of noodle, the remaining marinara sauce, and sprinkle with 0.5 oz of mozzarella cheese.
Cover the dish with foil and bake for 20 minutes.
Remove the foil and bake for an additional 10 minutes until the cheese is melted and the edges are bubbling.