I’m out of peaches and fresh curd cheese (Monday and Wednesday breakfasts).

I finished my breakfast pizza yesterday (Tuesday and Thursday breakfasts).

What’s for breakfast? I opened the refrigerator and look what I found:

Y’know, leftovers has a bad connotation. There ought to be a snappy euphemism.

When you cook something to be added back to a dish later, it’s reserved. “Brown the meat, remove from the skillet and reserve.”
Previously cooked might be another term. There are no longer used cars; they’re previously owned automobiles.

So it doesn’t matter how good that breakfast was (it was good!), I could rewrite that breakfast to sound more appealing:

Boy! That sounds good!