Slice the focaccia bread horizontally through the middle to create two equal halves. Scoop out some excess bread for extra filling space if desired. Drizzle olive oil over the cut sides and sprinkle with salt and pepper.

Layer fresh mozzarella slices on the bottom half, followed by prosciutto and roasted red peppers. Top with fresh arugula and drizzle balsamic glaze.

Place the top half of the focaccia back on the sandwich and press gently to keep fillings intact.

For a warm sandwich, preheat the oven to 350°F (175°C). Cut the sandwich into portions, place on a baking sheet, and bake for 5-7 minutes until golden brown and cheese melts.

Serve immediately for best flavor and texture, ideally with a fresh side salad.