Chicken Mac and Cheese

 300g dried rigatoni pasta
400g broccoli, cut into small florets
2 teaspoons olive oil
1 small brown onion, finely chopped
1 garlic clove, crushed
2 teaspoons wholegrain mustard
4 cooked chicken thighs, cut into 2cm pieces
3/4 cup frozen peas
1 cup grated pizza cheese

Bechamel sauce

50g butter
1/4 cup plain flour
2 1/2 cups milk

Go here for the rest.