Cowboy Breakfast Casserole With Sausage and Spinach

Ingredients

• 7 slices white sandwich bread
• 1 pound bulk breakfast sausage
• Softened unsalted butter or nonstick vegetable cooking spray (for pan)
• 4 scallions, white and pale green and dark green parts separated, thinly sliced
• 1 (10-ounce) package frozen spinach, thawed, squeezed dry
• 8 ounces cheddar cheese, shredded (about 2 cups)
• 8 large eggs
• 1 1/2 cups milk
• 1/2 cup full-fat Greek yogurt
• 1 teaspoon mustard powder
• 1/2 teaspoon kosher salt
• 1/2 teaspoon freshly ground black pepper
• 1/4 teaspoon ground nutmeg

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