Make the dressing by combining all the ingredients in a bowl except the olive oil and whisking with a fork. While whisking, slowly drizzle in the olive oil.
In a bowl, combine the bread cubes, diced garlic and salt and pepper to taste. Spritz with cooking spray while tossing. Spread on a baking tray and bake at 160 degrees C until golden, about 10 minutes.
In a salad bowl, place the lettuce, bread cubes and 3 tablespoons Parmesan cheese and toss. Drizzle over the dressing, toss and serve.