Preheat oven to 450 degrees.
Slice the spaghetti squash in half, longwise. De-seed/core the squash.
Spray the insides with the cooking spray and sprinkle with garlic powder and salt.
Flip over and stab with a fork or knife a few times (on the skin).
Place on a greased baking tray, cut side down. Bake in the oven for approximately 45-50 minutes.