Place the Beef, Red Kidney Beans, Peppers and Onion into your slow cooker pot.
Mix the Chilli Sauce sachet with 200ml of water and add to slow cooker pot, stir thoroughly. Add Tomatoes and stir again.
Cover and cook for 4 hours on HIGH or 8 hours on MEDIUM setting until the meat is tender and cooked through (keep covered during cooking, cooking times may vary between slow cooker models).
Ladle the Chilli into oven proof serving bowls.
Crush tortilla chips into small pieces, layer on top of the Chilli and sprinkle with grated cheese.
Bake in the oven for 10-15 mins until cheese melts.