Preheat your oven to 375°F (190°C).
Cook the lasagna noodles according to package instructions until al dente. Drain and lay them flat on a clean kitchen towel.
In a medium skillet over medium heat, combine the shredded chicken, chopped spinach, chopped artichokes, garlic powder, onion powder, and a pinch of salt and pepper. Cook for about 5-7 minutes until spinach is wilted. Remove from heat.
In a large mixing bowl, combine the ricotta cheese, 1 cup of mozzarella cheese, and half of the Parmesan cheese. Mix well.
Grease the baking dish with cooking spray or oil. Start layering the lasagna: Spread a thin layer of marinara sauce on the bottom, lay down 3 lasagna noodles, spread half of the ricotta mixture over the noodles, add half of the chicken and spinach mixture on top of the ricotta, and drizzle a quarter of the marinara sauce over the chicken.
Add another layer of noodles and repeat with the remaining ricotta mixture, chicken mixture, and another quarter of marinara sauce. Top with the final layer of noodles.
Spread the remaining marinara sauce over the top layer of noodles and sprinkle the rest of the mozzarella and Parmesan cheese evenly over everything.
Cover the baking dish with aluminum foil and bake for 25 minutes. Remove the foil and bake for an additional 20 minutes, or until the cheese is golden and bubbly.
Let the lasagna cool for about 10 minutes before slicing. Serve warm.