Sweet squash gives French onion dip a colorful nutrition boost (namely, vitamins A and E). Serve with chips and crunchy crudités.
Heat oil in a large saucepan over medium heat. Add onions; cover and cook, stirring occasionally, until browned and tender, 20 to 30 minutes. Coarsely chop the onions. Combine with squash, sour cream, yeast, vinegar and salt in a medium bowl. Refrigerate until cold, about 2 hours. Serve topped with chives, if desired.