Yesterday I had a leftover boiled potato, and a toddler in a high chair looking hungry but discerning. The lone potato would not cut it, but if I started fiddling around defrosting stuff, he´d howl. Answer; miso mashed potatoes, a David Chang conceit, but fine for all ages.
I heated the potato in the microwave, and then put a bit of butter and a bit of miso, mashed it with a fork, and that was that, a very popular instant hit.
You can also do that with sweet potatoes, and if it´s for you, don´t be shy with the miso. Your pork chop or chicken thighs will be very happy next to this.