Preheat the oven to 350 degrees and prepare a 9x13 dish with a light coating of cooking spray, set aside.

Prepare egg noodles according to package directions. While they are boiling, prepare the meat.

In a large skillet over medium heat, cook the ground beef along with the white parts of the green onion until cooked through. Add the garlic and cook for one additional minute.

Drain off the fat and add the marinara sauce. Set aside.

In a small bowl, whisk the sour cream with garlic powder, onion powder, salt, pepper and 4 Tablespoons of hot (not boiling) water. Set aside.

Drain the prepared egg noodles and immediately mix with the ricotta cheese in a large bowl. Add the sour cream mixture and stir until combined.

Add ½ of the creamy noodles to the prepared casserole dish. Top with half of the meat sauce and half of the mozzarella cheese. Repeat these layers, finishing with mozzarella on top.

Cover with aluminum foil and bake in the preheated oven for 20 minutes or until the casserole is warmed throughout and cheese is melted on top. Do not overcook.

Top with sliced green onion tops and serve warm.