Spaghetti Bolognese Lasagne

Ingredients

• 500 g lean beef mince
• 200 g spaghetti
• 1 onion (peeled and diced)
• 1 courgette (diced)
• 1 pepper, any colour (deseeded and diced)
• 100 g mushrooms (diced)
• 2 cloves garlic (peeled and crushed)
• 400g tin chopped tomatoes
• 250 g passata
• 1 beef stock cube
• 1 tbsp Worcestershire sauce or Henderson's Relish
• 1 tbsp balsamic vinegar
• 1 tbsp mixed herbs
• salt and pepper (to taste)
• low calorie cooking spray
• 300 g fat free Greek yoghurt
• 100 g reduced fat Cheddar cheese (finely grated)
• 2 eggs (beaten)