Ingredients
- 2 ½ pounds sweet potatoes, peeled and cut into 1/4-inch slices (about 8 cups)
- 3 tablespoons extra-virgin olive oil, divided
- 1 small onion, finely chopped (about 1 cup)
- 3 tablespoons all-purpose flour
- ½ teaspoon salt
- ¼ teaspoon white or black pepper
- 2 ½ cups low-fat milk
- 1 cup shredded Gruyère cheese, divided
- 2 teaspoons chopped fresh rosemary
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