Preheat your oven to 400°F (200°C). Peel the sweet potatoes and slice them into approximately 1/2-inch (1 cm) thick rounds. Arrange them on a baking sheet lined with parchment paper, drizzle with one tablespoon of olive oil, season with salt and pepper, and roast for 20 minutes, or until tender and slightly caramelized.
While the sweet potatoes are roasting, prepare your pie dish (about 9 inches/24 cm in diameter): lightly grease it with olive oil. Roll out the puff pastry and gently press it into the dish, ensuring it covers the bottom and sides. Prick the bottom of the pastry with a fork.
Line the pastry with parchment paper, weigh it down with pie weights (or dried beans), and blind-bake for 10 minutes. Remove the weights and parchment paper, then bake for another 5 minutes to crisp up the crust.
Remove the roasted sweet potatoes from the oven and let them cool slightly. Chop them into smaller pieces for easier distribution in the quiche filling.
In a bowl, whisk together the eggs, heavy cream, salt, and pepper until smooth and creamy.
Evenly spread the chopped sweet potatoes over the pre-baked pastry crust, then crumble half of the goat cheese on top. Pour the egg and cream mixture over the sweet potatoes and cheese.
Crumble the remaining goat cheese over the top. This will create a slightly browned and flavorful crust as it bakes.
Reduce the oven temperature to 350°F (180°C) and bake for 30-35 minutes, or until the filling is set and the top is golden brown. A knife inserted into the center should come out clean.
Let the quiche cool for 10 minutes before slicing and serving. This helps the slices hold their shape and prevents the filling from falling apart.
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