Baked spinach and cheese mushrooms

Ingredients (serve 4): 80ml (1/3 cup) olive oil 1 1/2 tablespoons balsamic vinegar 2 garlic cloves, crushed 1 tablespoon chopped fresh thyme leaves 8 (about 600g) large Portobello mushrooms, stems trimmed 90g baby spinach leaves 300g provolone or mozzarella, cut into 16 slices ½ loaf olive bread, thickly sliced, chargrilled   Method: Preheat oven to 220C.…