How Do You Make an Adverb out of a Separable Verb?

The verb I’m thinking about is “to blend in.” Do we have an adverb for it? Well, here’s the pattern I’ve seen in this situation. Last panel.

https://www.gocomics.com/frazz/2014/02/20

How would you say it? What verbs can you think of to change into adverbs?