Cheesy Mushroom, Leek & Prosciutto Toasts

Position rack in upper third of oven; preheat broiler to high. Brush bread with 1 tablespoon oil. Broil until golden and crispy on one side, about 2 minutes. When cool enough to handle, rub the toasted side with the cut side of the garlic. (Discard leftover garlic.)

Heat the remaining 2 tablespoons oil in a large skillet over medium-high heat. Add mushrooms in an even layer. Cook, without stirring, for 4 minutes. Add leek, pepper and salt and cook, stirring occasionally, until the mushrooms are golden brown and the leek is tender, 4 to 5 minutes more.

Divide the mushroom mixture, olives, prosciutto and mozzarella over the toasted sides of the bread. Broil until the cheese is melted, about 2 minutes. Sprinkle with parsley.