1. Brown ground turkey in a non-stick frying pan.
2. Add onions, carrots, squash, potatoes, pepper, and cumin. Sauté for about 5 minutes.
3. Add tomato sauce and just enough water to cover. Bring to a boil, then lower heat and simmer, uncovered, until vegetables are tender.
4. Dissolve cornstarch in about 1 Tbsp. of cold water, add to mixture, bring back to a boil until gravy thickens. Serve.