These are super simple, take under 20 minutes, and people love them.
For a dinner: Baked salmon with lemon, butter, garlic and dill. Saute some spinach on the side.
For a lunch: Sandwich. Crusty baguette, a soft cheese of some sort, slices of green apples. Maybe a cured meat like prosciutto if you are feeling that. Takes no time at all to make but feels fancy.
For a breakfast: Oatmeal with guava paste. It turns pink which is fun, then toast some slivered almonds in a bit of butter and server them hot on top.