1. In a 4- to 5-quart nonstick pan over medium-high heat, stir onion, prosciutto, and garlic in olive oil until onion is limp, 4 to 5 minutes. Add rice and stir until it begins to turn opaque, about 2 minutes.
2. Add broth and red peppers and bring to a boil; reduce heat to low, cover, and simmer until rice is tender to bite, 15 to 20 minutes. Scoop into a bowl. Sprinkle with parsley if desired.