Slow Cooker Beef Stew

Ingredients

• 1 kg stewing steak (all fat removed and diced)
• 1 large onion (chopped)
• 1 large courgette (chopped)
• 4 large potatoes (chopped into chunks)
• 4 large carrots (chopped)
• 2 beef stock cubes (made up with 400ml boiling water)
• low calorie cooking spray
• 1 tsp salt
• 1 bay leaf
• 1 tsp freshly ground black pepper
• 1 tsp paprika
• 1 tsp garlic powder
• 1 tsp onion powder
• 1 tbsp Worcestershire sauce
• 1 small swede (chopped)
• 1 large leek (chopped)
• 1 stick celery (chopped)