Baked vegetables al forno

Ingredients (serves 8): 2 yellow bell peppers, cut into 3cm pieces 2 red bell peppers, cut into 3cm pieces 450g (about 1-2) golden nugget pumpkin, seeds removed, cut into 3cm pieces 2 red onions, skin on, cut into wedges 2 brown onions, skin on, cut into 5mm-thick slices 1 large sweet potato, peeled, cut into…