Slow Cooker Lamb Moussaka

Ingredients

• 500 g diced lamb (all visible fat removed and diced quite small)
• 3 aubergines (sliced lengthways)
• 1 large courgettes (diced)
• 1 large onion (chopped)
• 2 cloves garlic (chopped)
• 1 tin chopped tomatoes (400g tin)
• 3 tbsp tomato puree
• 1 tsp granulated sweetener
• 2 tbsp red wine vinegar
• 1 bay leaf
• 1 tsp oregano
• 1 pinch cinnamon
• low calorie cooking spray
• sea salt
• freshly ground black pepper
• 500 g fat free natural yoghurt
• 2 eggs
• ½ tsp mustard powder
• 120 g reduced fat Cheddar (grated)