Wrap your chicken breasts in tin foil and place in the middle of a 3 tiered steamer and the cauliflower florets in the top tier.
Pour your boiling water in the base and simmer to boil for 30 minutes.
Now whiz the cauliflower, water, stock cube, paprika, mustard and Worcestershire sauce in a blender until smooth (you may need to swish it around for encouragement.
In a large frying pan, spray it with cooking oil spray and saute the onions and mushrooms until softened.
Slice the chicken in to bite size pieces and add to the pan to fry for another two minutes.
Pour in the cauliflower sauce and simmer for 10 minutes, turn off the heat and stir in the cheese.
Serve on to cooked spaghetti (we have 80g per person).