Savory Spinach and Mushroom Quiche Infused with Tarragon

Ingredients

• egg, carefully separated and set aside
• A generous tablespoon of water
• A beautifully prepared 9-inch single pie crust
• A pair of wholesome eggs
• One full cup of milk
• Two tablespoons of nourishing canola oil
• An 8-ounce package of freshly sliced mushrooms
• Half a cup of finely chopped onion
• A pinch of salt and freshly ground black pepper
• A 6-ounce bag of vibrant fresh spinach, finely chopped
• A hint of dried tarragon, paprika, and cayenne pepper
• One and a quarter cups of finely shredded white Cheddar cheese
• A slender small zucchini, thinly sliced into delicate rounds
• A quarter cup of shredded white Cheddar cheese