Slow Cooker BBQ Chicken. Slimming World friendly. 3 tbsp sweetener 2 tbsp balsamic vinegar 5 tbsp worchester sauce 1 tsp mustard powder 500ml passatta 2 cloves of crushed garlic Chicken breasts. I placed all the above ingredients in the Slow Cooker and cooked on low from 7am until 6pm. I served with jacket potato and grated cheese.