In a small bowl, mix the olive oil, balsamic vinegar (if using), and a pinch of salt. Add the blueberries to the bowl and gently toss to coat.
Spread the blueberry mixture evenly over the flatbread or naan.
Sprinkle crumbled goat cheese over the top.
Place the flatbread on a baking sheet lined with parchment paper.
Bake at 425°F (220°C) for 10–12 minutes, or until the edges are golden and the cheese begins to brown slightly.
Drizzle with honey or balsamic glaze, and garnish with fresh mint or arugula before serving.