Divide your pizza dough into 4 balls ( homemade or storebought) and shape into smooth balls. Set on a lightly oiled pan and cover to rise for one hour.
Preheat your grill to 450 Deg F. Clean the grates and brush with oil.
Roll out each dough ball to about 10-12 inches round. Brush one side with oil.
Place the oiled side down on your grill, then oil the top side of the pizza dough. Grill each side for 3-4 minutes, flipping once until the dough is cooked and puffy.
Let the pizza doughs rest for few minutes while grilling the peaches. Spray the peaches lightly with oil then grill for 1-2 minutes a side. Remove from the grill. Leave the heat on one side of the grill, turn it off on the other side.
Brush the top sides of the pizza doughs with olive oil ( or basil oil if you have it), season wit a little salt and pepper, sprinkle with the sliced garlic, pieces of fresh mozzarella and place the torn pieces of prosciutto on top of the cheese. Place back on the grill on the side with the heat turned off, until the cheese is melted and the prosciutto is getting crispy. Add the peaches and grill for one minute more.
Remove the pizzas from the grill then add the red chili flakes, arugula, drizzle the balsamic glaze and sprinkle some freshly grated parmesan. Serve hot!