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Grease an 8x8 heat resistant casserole / baking dish with your choice of fat: butter, coconut oil, ghee.
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Heat 1 tbsp butter / ghee / coconut oil in saucepan.
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Sauté mushrooms till soft, 4-6 minutes.
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In a large bowl whisk together eggs, milk, spices, green onions.
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Fold in spinach, suited mushrooms, cubed bread and half of the cheese. Mix well.
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Pour into casserole / baking dish and sprinkle with the rest of the cheese. If you can let it sit in the fridge for a few hours. If like, you can place it into the fridge overnight. So that you can just pop it to the oven on the day of your celebration!
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Bake it on 400F for 30 minutes.