In a skillet, cook the ground turkey over medium heat until browned.
Add the chopped spinach to the skillet and cook until wilted.
In a large bowl, combine the cooked turkey and spinach, mozzarella cheese, cottage cheese, marinara sauce, garlic powder, onion powder, salt, and black pepper.
Transfer the mixture to a baking dish and spread evenly.
Bake in the preheated oven for 30-35 minutes, or until the top is golden and bubbly.
Let the casserole cool for a few minutes before serving.
Notes:
This casserole is great for meal prep and can be stored in the fridge for up to 3 days.