Seven-layer bean dip never fails

I once produced a 7-layer bean dip I'd forgotten about at the end of a party, and it still got devoured. You just can't go wrong with any combination. This is simply refried beans, sour cream, salsa, cheddar cheese, fresh tomatoes, sliced olives and green onions. Guacamole would have been an excellent addition, but that would have required too much effort for Mai Ling!