Since Fog Cloud requires an Action and Misty Step a Bonus Action, you could cast them both in then same turn.
My questions is whether you can use Fog Cloud centered where you are and Misty Step to flee from there, so your enemies can't see where you step into.
Question arises because Misty Step says that you teleport somewhere you can see.
If it's not possible, would there be any way to do the same effect using this two spells? (teleporting but not letting enemies know where thanks to the Fog Cloud).