From Tasty.

@brandongouveia https://tasty.co/recipe/french-onion-grilled-cheese

French onion soup meets grilled cheese! Caramelized onions in the Instant Pot = all the flavor in half the time. Melty Gruyère, mozzarella, and jammy onions on sourdough… This is grilled cheese leveled up @brandongouveia