One-pot chilli mac’n’cheese

Name: One-pot chilli mac’n’cheese
Prep time: 10 min
Cook time: 35 min
Total time: 45 min
Cuisine: American
Ingredients: 500 g lean beef mince (less that 5% fat); 2 cloves garlic (crushed); 1 onion (finely chopped); 2 red peppers (diced); 1 400 g can chopped tomatoes; 1 tbsp tomato puree; 1 tbsp worcestershire sauce; 1 can red kidney beans (400g); 800 ml beef stock; 300 g dried macaroni pasta; 180 g cheddar (finely grated); low calorie cooking spray/spray oil