Preheat the oven to 425 degrees F. In a medium baking dish, combine the plums, butter, maple, and thyme. Transfer to the oven and roast for 20-25 minutes, until the plums caramelize. Meanwhile, lay the puff pastry flat on a parchment-lined baking sheet. Place the brie in the center of the pastry and remove a little of the rind from the top of the brie. I leave the rind on the bottom and sides intact. Spread the fig jam overtop of the brie and then fold the corners of the pastry over the brie. Brush the pastry with beaten egg and sprinkle lightly with sugar. Bake for 20-25 minutes or until the pastry is deep golden brown. To serve, spoon the plums over the brie. Top with fresh thyme. EAT and enjoy with your favorite bread or crackers…or just with a spoon.: You will notice a warm, dry heat fill the oven that is ideal for both roasting fruit and browning pastry. The high temperature helps the plums caramelize quickly, encouraging sugars to bubble and darken without evaporating all the juices. A common mistake is placing the oven rack too low, which can burn the bottom of the pastry, so position the rack in the center. If your oven runs hot, lower the temperature by 10 degrees to avoid overbrowning.
In a medium baking dish, combine the plums, butter, maple, and thyme: As the ingredients meet, you will hear a faint hiss as the room temperature butter begins to soften around the sliced plums . The maple syrup will coat the fruit, creating a glossy exterior that will later bubble into a syrup. Using fresh thyme gives off a fragrant steam that hints at the final aroma. Avoid overcrowding the dish, because crowded fruit steams instead of caramelizing, leaving you with less concentrated flavor.
Transfer to the oven and roast for 20 to 25 minutes, until the plums caramelize: During roasting you should see the edges of the plums darken and the juices thicken into a sticky glaze, while a sweet, nutty aroma develops from the maple. The sound is quiet, a gentle simmer as the sugars concentrate. If the fruit browns too quickly, tent loosely with foil to finish softening without burning. Overroasting will collapse the plum slices into an indistinguishable jam, so check at the earlier time if your plums are very ripe.
Meanwhile, lay the puff pastry flat on a parchment lined baking sheet: The chilled puff pastry should feel firm yet pliable, and you will appreciate its smooth surface as you work. Laying it on parchment prevents sticking and makes transfer easier after assembly. If the pastry becomes sticky while you work, pop it in the refrigerator for a few minutes. A common slip is handling warm pastry, which can lose layers and fail to puff.
Place the brie in the center of the pastry and remove a little of the rind from the top of the brie: When you remove the small top rind, you expose creamy interior that will begin to melt and mingle with the fig jam . I leave the bottom and side rinds intact to help the cheese hold its shape. You should feel the weight of the 18 ounce wheel and the slight tack of the rind. Cutting away too much rind will let the brie leak through the pastry as it melts, so only remove a modest portion.
Spread the fig jam overtop of the brie: The fig jam forms a sweet cushion that complements both the brie and the roasted plums . Spread the rounded tablespoon evenly so each slice will include a bit of jam in the final bite. If you heap it too heavily in one spot, it can seep out and make the pastry soggy beneath, so distribute it gently and evenly.
Fold the corners of the pastry over the brie: As you bring each corner up, the pastry layers will feel firm and cold, sealing the wheel into a tidy parcel. Crimp gently to make sure seams meet, and if there are small gaps, press lightly to close them. The tactile feedback is important here, because loose seams can open during baking, letting cheese escape. If the pastry gets soft while folding, chill briefly to firm up before continuing.
Brush the pastry with beaten egg and sprinkle lightly with sugar: The beaten egg creates a glossy, browned finish while the coarse sugar adds tiny crunchy crystals on top. Brush evenly but avoid pools of egg wash that can drip down and burn. If you brush too heavily, sugar may sink into wet spots and not caramelize properly, so aim for a thin, even coat and a light dusting of sugar.
Bake for 20 to 25 minutes or until the pastry is deep golden brown: In the oven the puff pastry puffs and turns an irresistible amber hue, and the aroma of melted brie mingles with roasted plums . The sound is quiet, but watch for bubbling juices at the seams as a sign the cheese is warm inside. A common error is underbaking which leaves pastry pale and doughy, so wait for a full golden color. If the top is browning too fast, tent with foil for a few minutes until the center warms through.
To serve, spoon the plums over the brie: Spoon the glossy roasted fruit over the warm parcel, the syrup will trickle over the pastry and pool slightly, making each forkful vibrant and saucy. Garnish with additional sprigs of fresh thyme for aroma and color. A mistake some people make is letting it cool too long before serving, which causes the brie to firm up and lose that irresistibly oozy texture, so serve while still warm for best results.