Layered salad with Parmesan croutons

Name: Layered salad with Parmesan croutons
Ingredients: 3 thick slices white bread (day old is better); 1 tbsp olive oil, plus extra for greasing; 75g /2½ fl oz parmesan (or vegetarian alternative), 25g grated, 50g shaved; 500g new potatoes, thickly sliced; 200g green beans; 4 Baby Gem lettuces, leaves separated and torn; 150g pot fat-free yogurt; 25g parmesan, finely grated; juice ½-1 lemon, depending on taste; 2-3 tbsp olive oil; 2 tbsp white wine vinegar; dash Tabasco sauce; 1 garlic clove, crushed