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Export 9 ingredients for grocery delivery
Step 1
Preheat oven to 350 degrees Fahrenheit and lightly grease a 9-inch deep dish pie plate.
Step 2
Heat olive oil in a large skillet over medium high heat. Add in onion and mushroom and saute until softened, about 5 to 7 minutes. Add in garlic and cook 1 minute more. Turn off heat and stir in spinach, feta, and cheddar cheese. Spoon mixture into the prepared pie plate.
Step 3
In a mixing bowl, whisk together eggs, milk, salt, and pepper. Pour egg mixture over the spinach mixture in the prepared pie plate.
Step 4
Bake in the preheated oven for 40 to 45 minutes, until eggs are set. Let cool 10 minutes before slicing and serving.