Heat some oil in a an oven-safe large skillet over medium heat.
Add the onions and cook until translucent.
Stir in the garlic and red crushed pepper and cook for 20 seconds.
Add the beef and cook until browned.
Season with Italian seasoning, salt, pepper, and granulated garlic.
Add the tomato paste and cook for an additional minute.
Add the crushed tomatoes, sugar, fresh basil, and season with salt and pepper.
Cook the meat sauce for 15 minutes.
Cook the rigatoni 2 minutes less than what the packaging instructions recommend.
Add the cooked rigatoni to the meat sauce and stir well.
Stir in 2 cups of mozzarella cheese and ricotta cheese.
Check for seasoning and then add the remaining mozzarella cheese over the skillet and bake for 10 minutes uncovered.
Broil for 1 minute or until the cheese is completely melted.
Garnish with fresh basil, if desired.