Wash squash (approximately 4 inches in diameter) and trim ends.
Cut squash crosswise into halves and scoop out seeds and more to make a bowl. Set aside.
Sauté onions for 5 minutes, then add rest of the ingredients along with the scooped out seeds. Cook on medium for 15 minutes to make a thickened stuffing.
Pack stuffing firmly into squash halves.
Place squash in a roasting pan, cut side up. Fill pan with 1/2 cup water.
Cover with foil and bake at 375 [degrees] F until squash is easily pierced with a fork, about 45 minutes.