- Preheat your oven to 375°F (190°C). Place the pie crust in a pie dish and press it firmly against the bottom and sides. Trim any excess crust hanging over the edge.
- In a skillet, heat olive oil over medium heat. Add the sliced mushrooms and cook until they release their moisture and become golden brown, about 5-7 minutes.
- Add the chopped spinach to the skillet and cook until wilted, about 2-3 minutes. Remove from heat and let cool slightly.
- In a mixing bowl, whisk together the eggs and milk until well combined. Season with salt, pepper, and nutmeg if using.
- Spread the mushroom and spinach mixture evenly over the bottom of the pie crust. Sprinkle shredded cheese on top.
- Slowly pour the egg mixture over the vegetables and cheese in the pie crust.
- Carefully transfer the quiche to the preheated oven and bake for 30-35 minutes, or until the center is set and the top is golden brown.
- Once baked, remove the quiche from the oven and let it cool for a few minutes before slicing and serving.
Enjoy this creamy spinach and mushroom quiche warm or at room temperature, alongside a fresh salad or as part of a brunch spread. It's a versatile dish that's both satisfying and nutritious.