Hard-Boiled Egg Casserole

Ingredients (10)

• ✓ 8 hard-boiled eggs, peeled and halved
• + ¼ cup butter add to pantry
• + ¼ cup all-purpose flour add to pantry
• + 2 cups half-and-half add to pantry
• + ½ teaspoon salt add to pantry
• + ¼ teaspoon ground black pepper add to pantry
• + ¼ teaspoon garlic powder add to pantry
• + ¼ teaspoon dry mustard add to pantry
• + 1 cup shredded Gruyere cheese add to pantry
• + ½ cup freshly grated Parmesan cheese add to pantry