Recipe challenge: mismatched leftovers = dinner?

I need dinner for three, and I don’t want to go out and buy anything today.

In my refrigerator from recent dinners:

• 1 medium baked potato
• 1 medium yam
• about ½ cup of fresh green beans cooked in a skillet and then tossed with sesame oil
• part of a chicken breast and thigh, baked

I’d like to use the yam and baked potato if possible.

Also available (uncooked):
• potatoes
• half a dozen eggs
• some shredded cheese
• a little fresh baby spinach
• part of a green pepper
• about a pound of white mushrooms
• fresh parsley
• milk

and assorted staples, frozen items, and conventional seasonings

What would happen if I boiled some potatoes and then mashed in the baked potato and yam? Bad idea? What if I added cheese? and how about the mushrooms and spinach?

Thanks for any ideas, especially those that don’t involve hours of preparation.