Coat 12-cup mini-muffin pan with cooking spray or lightly oil.
Press 1 piece prosciutto (folding to shape) into cup. Fill each with small amount of goat cheese and olives.
Whisk together eggs, sour cream, chopped rosemary and pepper to taste; divide among cups.
Bake in 400°F (200°C) oven for 10 to 12 minutes or until filling is set. Let cool on rack for a few minutes before removing from pan. Serve warm or at room temperature garnished with rosemary sprigs, if desired.