Macaroni and Cheese with Califlower

12 oz multigrain elbow macaroni
1 head cauliflower
4 slices bread, torn
1/2 C fresh parsley, chopped
3 T olive oil
salt and pepper
1 onion, finely chopped
1 1/2 C sour cream
1 1 /2 C extra sharp cheddar cheese, grated
1/2 C milk
1 T dijon mustard

Heat oven to 400. Cook past, add cauliflower durin glast 3 minutes of cook time, drain. Take bread and make crumbs. Add parsley, 1 T oil, and 1/4 salt, 1/4 pepper. Combine and set aside. Return the pasta pot to med heat and add remaining T of oil. Add onion, 3/4 t salt, 1/2 t pepper and cook, just until soft. 5-7 minutes. Mix in pasta, cauliflower, cheese, sourcream, milk, and mustard. Transfer to baking dish. Sprinkle bread topping. Bake until golden 12-15 minutes.