As someone who supposedly grew up "rich" (I didn't, but I guess to bottom-of-the-barrel poors, middle class looks like extreme wealth), my mother or nanny/housekeeper cooked what I would consider regular, everyday food. Roasts (lamb, pork, chicken, pharaoh, goat/ibex etc but rarely beef since none of us really like roast beef much), soups/stews (beef stew with red wine and laurels, beef stew with tomatoes, potatoes and peas, bouillabaisse/frutti di mare, chicken soup with lovage and marjoram, curries etc), pasta dishes, risotto (my favourites are summer truffle, saffron, tomato and others, including plain ol' peas), vegetable dishes (ratatouille, various parmigiane such as courgette or aubergine, asparagus souffle, capcay sayuran etc) and so on. Just a normal varied diet.
Now, I went to school with some legit rich kids. Y'know... with billionaire parents and shit. Many literally ate fucking tendies and pizza rolls all day. Only a few with those white guilt mothers ate what I would call actual food, but it was mostly in the most unappetising manners.