Well I am not a good cook (basically I can make the food edible, that's kinda it), but I sometimes buy diced beef, either dice or slice potatoes, chop some onions, and then stir fry them together.

The other thing I sometimes do is add beef chunks, onions, tomatoes, and tofu into a hot of water and boil it (also add some salt and perhaps chicken stock for flavour).

Most of the time my wife cooks because she knows how to flavour food better than I do (let's just say my knowledge of flavouring food is close to nil), and she knows how to do more dishes.