Because I don’t have a microwave, reheating leftover baked potatoes isn’t very easy. Yes, I could do them in the oven, but if I’m not careful, I’ll dry out the potatoes as they recook. I have a few leftover baked potatoes from last night, so I went searching for ideas for them this morning. I thought I’d share my findings. 1  Twice baked potatoes – The insides of the potatoes are scooped out, mashed with cheese and other savory ingredients, then scooped back in to be baked again. 2  Diner Home Fries – Leftover baked potatoes are sliced and fried with onion and green pepper for an East coast diner specialty.