01 - Preheat oven to 400°F. Line a rimmed baking sheet with parchment paper and set aside.
02 - Unroll the thawed puff pastry onto the prepared baking sheet. Using a sharp knife, score a ¾-inch border around all edges without cutting through the dough. Prick the center area evenly with a fork to prevent puffing. Brush the scored border with the beaten egg wash.
03 - In a mixing bowl, combine the softened goat cheese, crème fraîche, minced garlic, and lemon zest. Season with salt and pepper, then stir until the mixture is smooth and creamy. Spread the filling evenly across the center of the pastry, staying within the scored border.
04 - Toss the trimmed asparagus spears with olive oil, a pinch of salt, and pepper. Lay the spears in a neat, even layer over the cheese filling, aligning them in the same direction for an attractive presentation.
05 - Bake on the center rack for 30 to 35 minutes, until the pastry border is puffed and deep golden brown and the asparagus is fork-tender.
06 - Remove from the oven and scatter fresh thyme leaves over the top. Allow the tart to cool for 5 to 10 minutes before slicing into portions. Serve warm or at room temperature.