Preheat oven to 450 F. In a small bowl, stir together ricotta, parmesan, and garlic. Season to taste with salt and pepper.
Dust a work surface with flour. Use your hands to stretch the dough to roughly 12 inches in diameter.
Brush the dough all over with olive oil. Spoon the ricotta mixture over the top and spread in an even layer, leaving a 1 inch border.
Transfer the pizza to the oven and cook until golden brown on the edges and dough is set, about 15 minutes.
Remove the pizza from the oven and let cool slightly. In a large bowl, whisk the remaining olive oil with the vinegar. Toss the greens in the dressing and transfer to the pizza.
Top with prosciutto and nectarine. Cut into 8 slices before serving.