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Spinach, Mushroom & Egg Casserole
“This delightful spinach, mushroom and egg casserole is layered with earthy cooked mushrooms and baby spinach, fluffy eggs and nutty cave-aged Gruyère that deepens the flavor. Serve this easy casserole for breakfast, brunch or even dinner with a green salad on the side.”

By Marianne Williams   Updated on September 18, 2023
Reviewed by Dietitian Emily Lachtrupp, M.S., RD
Tested by EatingWell Test Kitchen

Added 3-19-2024
Ingredients
  • 2 tablespoons extra-virgin olive oil
  • 1 pound cremini mushrooms, trimmed and sliced
  • 5 medium cloves garlic, finely chopped
  • 2 teaspoons dry mustard
  • 1 teaspoon onion powder
  • 1 teaspoon salt
  • 5 ounces baby spinach
  • 12 large eggs
  • ¾ cup half-and-half
  • 1 ½ cups shredded Gruyère cheese, preferably cave-aged (see Tip), divided
  • 2 teaspoons fresh thyme leaves
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