For a richer flavor, roast the vegetables alongside the squash. Toss them with olive oil, salt, and pepper before spreading them on a baking sheet. Add them to the squash after both are roasted. Feel free to add protein, such as cooked Italian sausage, ground turkey, or chickpeas, to the sauce for a heartier meal. Fresh herbs, like basil or oregano, add a bright flavor boost. Stir them in at the end.