Quiche and salad
I frequently have quiche and salad for lunch. It's too much of a pain to make from scratch, but my grocery store has a half quiche for $4.99, which is 3 servings.
They usually have three flavors:
To heat or reheat. Preheat the oven to 350°F. Put the quiche on a pie pan. Bake for 10 minutes.
I usually eat two of the servings and freeze one, so I don't have to eat all of the quiche at once. Put the slice in a vacuum bag and freeze. Then vacuum seal at low pressure (15 seconds, 0.8 mPa).
To reheat, heat the vacuum sealed bag in the sous vide for 30 minutes at 140°F. Then heat in the oven as above.