Heat oven to 350 degrees.
Spray a deep 9' pie pan with cooking spray
In a small bowl, gently stir together 2 cups cooked spaghetti squash, 1/4 cup parmesan cheese, and 1 egg.
Press into pie pan with a spatula, bake 10 minutes and set aside.
While crust is baking: lightly sauté onion, garlic and cooked ground beef until warmed through. Add sauce.
Stir ricotta cheese, Italian seasoning, and remaining egg together, and pour into crust.
Top with sauce and meat mixture. Sprinkle with grated cheeses.
Bake 30 minutes until warm & bubble. May broil if desired to finish. Let sit 15 minutes.