I have an amazingly easy chilli recipe, we eat it all the time (only downside can be the windy after-effects!).
For 4-6 people (depending on their size!), chop a large onion and soften in a little oil. When it's slightly browned, add a can of kidney beans, a can of adzuki beans and a can of borlotti or haricot beans (all drained and rinsed well obviously). Fry them off for a couple of minutes, then add a can of baked beans in tomato sauce, a large jar of passata (or you could seive your own tinned tomatoes) and a little squeeze of tomato puree. I add a sprinkle of black pepper and paprika, and about 3 level teaspoons of hot chilli powder (but experiment - you can always make it hotter, but not cooler!).
Let it simmer on the hob on very low, for about half an hour - 40 minutes, stirring occasionally. The longer you leave it, the thicker, richer and spicier it gets (and the yummier!).
Serve it with lots of rice, or in wraps with cheese and salad. Best thing is, it tends to make loads (you need to use a large pan or casserole), and it freezes well in little tubs. We make a batch, then you just microwave, or defrost and hob-cook a little portion every time you fancy a jacket potato or something!
Really easy, really healthy, really yummy and really CHEAP!