Preheat the oven to 400. Line two baking trays with silicone mats.
Unroll your pastry dough and cut in to 24 equal squares. (6 cuts along the longer side and 4 cuts along the shorter side.) Place 12 on each prepared baking tray. Score a smaller square about 1/4 inch in from the edge of each cut square and prick the smaller square a few times with a fork.
Whisk together the egg and water and brush lightly over each square.
Toss the tomato halves with the olive oil and a sprinkle of salt and pepper.
Spread a good amount of goat cheese in the middle of each square of pastry, sprinkle with pepper and thyme, then top with at least one red and one yellow tomato half, cut side up.
Bake for 13-15 minutes or until golden brown. Remove from the oven, top with a few strips of shredded basil.
Drizzle with balsamic glaze reduction right before serving if desired!