Using a fork, mix together the turkey, pumpkin puree, sage, sugar, cinnamon, salt, black pepper, nutmeg, ginger, garlic powder and egg in a large bowl. Refrigerate for at least 30 minutes to help firm.
Preheat the oven to 350 degrees F. Line a baking sheet with parchment paper.
Form the turkey mixture into evenly sized (approximately 1.5-inch) meatballs. You should end up with about 22 in total. Note: If they're fussy, you can smooth them into a rounded shape once they're on the baking sheet.
Bake the meatballs for 15 minutes on one side. Carefully turn them over and bake for an additional 15 minutes. Add the meatballs to a pot of simmering Cinnamon-Sage Tomato Sauce. Cover and simmer for another 10 to 15 minutes, allowing the meatballs to soak up the yummy sauce flavor. Serve with the Spaghetti Squash "Pasta."
Add the broth, tomato sauce, pumpkin puree, basil, garlic powder, cinnamon and sage to a large pot and mix well. Bring to a boil, reduce the heat and simmer, uncovered, for 15 minutes. Season with salt and pepper to taste. Sprinkle on some crushed red pepper to kick up the heat if desired.
Microwave the spaghetti squash to soften slightly, about 4 minutes.
Slice off the ends of the squash, then slice in half lengthwise. Scoop out the seeds and pulp. Place the squash cut-side down in a baking dish with an inch of water. Microwave for 9 to 10 minutes. Once cool, use a fork to scrape out spaghetti-like strands.
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