To make the garlic butter you can use a small frying pan on the stove or just use the saute' function on your instant pot once they are done cooking. just simply remove them, dump water out
Melt the butter
Saute the garlic until fragrant 1-2 minutes
add the brussel sprouts, add a dash of salt and pepper
Saute in the butter for a few minutes, tossing to coat them well!
transfer to a serving dish and sprinkle with Parmesan cheese.