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Three-Cheese Spinach, Portabella & Mushroom Quiche

Created by ComfortCook on July 7, 2014

1 refrigerated pie crust (9-inch deep dish, thawed according to package instruction)
2 tablespoons oil
3 portabella mushrooms (sliced)
1/2 red onion, sliced
2 garlic cloves, minced
1 cup milk
1 box (10 ounce) frozen chopped spinach (thawed, squeezed to drain)

Step 1: Heat oven to 350°F.
Step 2: Place the thawed pie crust in 9-inch glass pie plate. Using fork, poke holes in the base all over and bake according to package directions.
Step 3: Meanwhile in medium skillet, heat oil. Add mushrooms, red onion slices and garlic; cook over medium-high heat until soft, about 4 to 5 minutes. Cool slightly.
Step 4: In medium bowl, combine milk, spinach, egg whites, eggs, salt and pepper; stir until all ingredients are well combined. Stir in Gouda cheese, cheddar cheese and cooled mushrooms mixture. Pour egg mixture into pie shell.
Step 5: Sprinkle Gorgonzola cheese over top.
Step 6: Bake 35 to 40 minutes or until center is puffed and light golden brown. Cool 10 minutes.