Preheat oven to 425F.
Cut squash in half length-wise and remove seeds and loose bits.
Sprinkle oil on squash halves and season with salt and pepper to taste
Place squash face down on a baking sheet and bake for 40 minutes
Meanwhile, brown ground beef in a pan.
Add tomato sauce and seasonings, salt and pepper and let simmer.
In a bowl, mix the ricotta or cottage cheese with half of each the mozzarella and parmesan cheese. Add additional seasonings, if desired.
When squash is finished baking and has cooled a bit, add 1/2 of the beef and tomato mixture.
Layer with ricottca-cheese mixture.
Add the rest of the sauce. Top with the rest of the shredded cheese.
Place squash back in the oven for 10 minutes or until browned.
Additionally, you can broil for a few minutes to brown the cheese further if you like that sort of thing!
Top with fresh parsley and more parmesan cheese to serve.