In a large skillet, cook the ground beef over medium heat until browned. Drain any excess fat.
Add the marinara sauce, garlic powder, onion powder, dried oregano, salt, and pepper to the skillet. Stir to combine and let it simmer for 5 minutes.
In a mixing bowl, combine the ricotta cheese, 1 cup of mozzarella cheese, and 1/2 cup of Parmesan cheese.
In a baking dish, layer half of the meat sauce, followed by the ricotta mixture, and then the remaining meat sauce. Top with the remaining mozzarella and Parmesan cheese.
Bake in the preheated oven for 20-25 minutes, or until the cheese is melted and bubbly.
Let the casserole cool for a few minutes before serving. Enjoy!
Notes:
This keto spaghetti casserole is perfect for meal prep and can be stored in the fridge for up to 5 days.