Bake in the center of the oven for 12 to 14 minutes, until the edges are browned and the centers are still light. Let cool for 10 seconds, then using a spatula, invert one tuile and place a paper fortune in the center. Fold the tuile in half and then bring the ends together, using the rim of the coffee mug to make the crease. Set the fortune cookie in a muffin cup to hold its shape. Repeat with the second tuile. If the tuile hardens, return it to the oven for a few seconds. Repeat with the remaining batter and fortunes. Let the cookies cool completely before serving.