8 ounces spicy or sweet turkey sausage links, casings removed, meat crumbled
2 scallions, sliced
6 large eggs and 6 large egg whites
1 3/4 cups 1-percent milk
Kosher salt and freshly ground black pepper
One 9-ounce package frozen chopped spinach, thawed and drained of excess liquid
3/4 cup shredded Cheddar
1/2 cup grated Parmesan
1/2 whole wheat baguette, cut into 3/4-inch cubes (about 4 cups)
Cooking spray
Make-Ahead Tip: Freeze the baked casserole for up to 2 weeks. Cover with foil and reheat at 350 degrees F until hot, 35 to 45 minutes.