Spaghetti Squash without shrimp pecorino back

1 medium spaghetti squash (about 3 lbs) 1 cup (or more) sliced fresh mushrooms 1 small onion , peeled and chopped 2 garlic cloves, peeled and minced 1 26-oz.[...]

4 spaghetti squash (prick with fork and cook in big pot of boiling, salted water for approximately 20 mins or until soft, let cool) Extra Virgin Olive Oil 1[...]