6 cups chopped broccoli florets (about 1 pound) |
3/4 cup minced shallots (about 4 large) |
2 tablespoons dijon mustard |
1 teaspoon chopped fresh thyme |
1/2 teaspoon minced garlic |
1/8 teaspoon ground nutmeg |
3/4 teaspoon salt, divided |
1/2 teaspoon freshly ground black pepper |
2 pounds peeled yukon gold potatoes, cut into 1/8-inch-thick slices |
cooking spray |
3 tablespoons all-purpose flour |
1 1/2 cups 2% reduced-fat milk |
1 1/4 cups fat-free, less-sodium chicken broth |
2 tablespoons chilled butter, cut into small pieces |
3/4 cup (3 ounces) shredded gruyère cheese |