Preheat the oven to 400 degrees F. Slice spaghetti squash in half lengthwise. Rub inside of squash with olive oil. Bake for 35 minutes.
Meanwhile, saute onions, pork, and peppers until cooked and tender. Set aside.
When squash is done, lower the oven temperature to 375 degrees F. Pull out the tender strands of the squash with a fork. Mix all the ingredients together thoroughly and pour into a 8x8 or 9x9 baking dish. Bake at 375 degrees F for one hour. Make sure the center if firm before serving.