Here is the fragment again:

But found only a cookie bag full of crumbs and a tablespoon of milk.

You correctly identified the fragment as a lonely verb phrase. Found, the verb without a subject, is the clue.

To fix this fragment, you could add a subject, like this:

But Frankie found only a cookie bag full of crumbs and a tablespoon of milk.

Or you could use Punctuation Rule 8:

Main Clause + Ø + Lonely Verb Phrase.

Frankie rushed into the kitchen for a snack but found only a cookie bag full of crumbs and a tablespoon of milk.

Enjoy your throne!

Go to the next fragment.

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