Creating Sweet Potato & Goat Cheese Quiche is a delightful process. Follow these simple steps for an incredible culinary experience:

1. Preheat the Oven: Preheat your oven to 375°F (190°C).
2. Prepare the Sweet Potatoes: Toss the diced sweet potatoes in olive oil, salt, and pepper. Spread them on a baking sheet and roast for 20 minutes, or until tender.
3. Sauté the Onions and Garlic: In a skillet over medium heat, add the diced onion and sauté for 5-7 minutes, until translucent. Add the minced garlic and cook for an additional minute.
4. Whisk the Eggs and Cream: In a large bowl, whisk together the eggs, heavy cream, salt, black pepper, and nutmeg until well combined.
5. Combine Ingredients: Once the sweet potatoes are done roasting, let them cool slightly. Add them to the egg mixture along with the sautéed onions and garlic, goat cheese, and thyme (if using), stirring gently to combine.
6. Assemble the Quiche: Pour the mixture into the prepared pie crust, spreading it evenly. Top with grated Parmesan cheese for added flavor.
7. Bake: Place the quiche in the preheated oven and bake for 35-40 minutes, or until the center is set and the top is golden brown.
8. Cool: Once baked, remove the quiche from the oven and allow it to cool for 10-15 minutes before slicing. This resting time helps the filling to firm up.
9. Slice and Serve: Cut the quiche into wedges and serve warm or at room temperature.

This approach ensures you prepare a truly incredible Sweet Potato & Goat Cheese Quiche that will impress your family and friends.