Portobello, Broccoli and Red-Pepper Melts

small head broccoli, cut into small florets (stalk discarded)

olive oil

Coarse salt and ground pepper

portobello mushrooms (stems removed), sliced 1/2 inch thick

red bell peppers (ribs and seeds removed), sliced 1/2 inch thick

light mayonnaise

small garlic clove, crushed through a press

thick slices country bread

Gouda cheese, thinly sliced