This is totally the kind of thing I end up making when it's 8:30 and I suddenly realize the only thing I've consumed all day is coffee and a bowlful of grape tomatoes. It's a good thing we usually have whitefish and bags of peas hanging out in the freezer at any given time.
Fish: defrost filet in hot tap water. If you are me, pry your defrosted filet from the second one firmly clinging to its side. Dry with a paper towel, season with salt and pepper, and sear both sides over high heat in some olive oil or butter. Butter is better.
Peas: you can defrost these in hot water too, if you want, but I usually don't bother. Sauté chopped garlic in olive oil or butter for a minute or so; add peas, salt & pepper, & cook, stirring occasionally, until peas are hot through.
Throw everything on a plate and eat it immediately. Drink a glass of white wine if you can swing it.
A hot fish waits for no one.