Cauliflower Mac and Cheese

Name: Cauliflower Mac and Cheese
Ingredients: * 8 ounce elbow macaroni, preferably whole; grain; * 10 ounce cauliflower floret (about 3 cup); * 2 cup low fat (1%) milk; * 1 bay leaf; * 1 large clove garlic, peeled and smashed; * 3 ounce grated sharp cheddar cheese (about 1 cup); * 2 tablespoon grated parmesan or pecorino cheese; * 1/2 teaspoon mustard powder; * 1/2 teaspoon kosher salt; * 1/4 teaspoon black pepper; topping (optional):; * 1/4 cup whole wheat breadcrumb; * 1 tablespoon parmesan cheese; * 1 tablespoon chopped parsley; * 1 teaspoon olive oil