Creating your Spring Vegetable Quiche is straightforward when you follow these simple steps:

1. Preheat Oven: Preheat your oven to 375°F (190°C).
2. Prepare the Veggies: In a skillet, heat olive oil over medium heat. Add the chopped onion and sauté until translucent, about 3-4 minutes. Add the asparagus and cook for an additional 5 minutes, then stir in the spinach until wilted. Remove from heat and let cool slightly.
3. Prepare the Pie Crust: Place the pre-made pie crust into a 9-inch pie plate, gently pressing it down to fit. Trim any overhanging edges as needed.
4. Make the Custard: In a large mixing bowl, whisk together the eggs, heavy cream, salt, pepper, and garlic powder until well combined.
5. Combine Ingredients: Sprinkle the sautéed vegetables evenly over the pie crust. Pour the egg mixture over the vegetables, ensuring even coverage.
6. Add Cheese: Sprinkle the shredded cheese on top, distributing it evenly.
7. Bake: Place the quiche in the preheated oven and bake for 35-40 minutes or until the custard is set and the top is golden.
8. Cool and Slice: Once removed from the oven, allow the quiche to cool for about 10-15 minutes before slicing.
9. Garnish: If desired, sprinkle fresh herbs on top for an extra touch of flavor and color.

By following these steps, you will have a delicious and satisfying Spring Vegetable Quiche ready to serve.