Serves 8; Makes about 12 cups; Prep time: 20 minutes; Total time: 1 hour 20 minutes
2 pounds butternut squash (about 1 medium), peeled, seeded, and cut into 1 1/2-inch pieces
2 pounds red new potatoes (12 to 14), well scrubbed and quartered
1 pound medium red onions (about 2 to 3), peeled and quartered
1 pound carrots (6 to 8 medium), halved lengthwise, if thick, and cut into 1 1/2-inch lengths
4 to 6 garlic cloves, peeled and smashed
3 tablespoons olive oil
Coarse salt and ground pepper
1. Preheat oven to 450°. Divide vegetables and garlic between two rimmed baking sheets (or line with parchment paper, if desired, for easy cleanup); dividing evenly, toss with oil, 2 teaspoons coarse salt, and 1/4 teaspoon pepper.
2. Roast until vegetables are tender and beginning to brown, 40 to 50 minutes, tossing them and rotating sheets from top to bottom halfway through. Serve hot or at room temperature. (To store: Let cool, place in an airtight container, and refrigerate up to 3 days. Pour off any accumulated liquid before using.)