Rinse and drain the beans. Spread the chips in a large flat casserole dish. Peel the onion. Wash the tomatoes. Clean and wash the peppers.
Finely dice onion, tomatoes and paprika and mix with the beans. Season with salt and pepper and spread on the chips. Sprinkle with cheese. Bake under the hot oven grill for 5-8 minutes.
Squeeze the lime. Halve avocado, remove core. Remove the flesh and crush finely with a fork. Season with lime juice, salt and pepper. Serve the avocadomus and chilli sauce with the nachos.