Overnight Croissant Breakfast Casserole With Spinach And Sausage

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"Spinach, sausage, eggs & cheese. Perfect for company or a holiday morning breakfast."
-- @bakedinarizona
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Serves or Makes: 10

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ingredients

  • 4-6 large croissants (day old are best)
  • 1 pound Italian or spicy sausage
  • 2 cups chopped onion
  • 1-2 cups fresh spinach
  • 2 cups grated Cheddar, Monterey Jack, Pepper Jack, Mozzarella, or a combo
  • 12 large eggs
  • 1 1/2 cups half and half
  • 1 teaspoon dry mustard
  • 1 teaspoon salt
  • 1 teaspoon fresh ground pepper
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