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Heat the oil in a deep frying pan, then fry the onion, pepper and garlic for 8-10 mins until softened. Add the mince, breaking it up with a wooden spoon as you go, and stir until it browns all over. Tip in the tomatoes and chipotle, or barbecue sauce, and add a little seasoning. Simmer for 10-15 mins until the sauce has thickened.
Put the cheese slices on top of the mince and cover with a lid for 2 mins to let it melt into the sauce. Pile into the buns with the crispy onions, and lettuce on the side for scooping up the extra sauce.