Preheat oven to 350 degrees.
Remove skin of squash, cut off ends, halve and scoop out seeds. Cut each half into approx. 1 inch cubes.
Halve and core apple and cut into 1 inch cubes. (any apple works, but the more firm and tart baking varieties add a lot more flavor.)
Combine squash,apple and raisins in an 8x8 shallow baking dish and spray with olive oil non-stick coating. Stir lightly to coat all pieces.
Sprinkle mixture with cinnamon and brown sugar substitute.
Cover dish with aluminum foil and bake for approximately 30 minutes or until squash is fork tender.
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