Mar 2, Order a grilled cheese, and what you get is a soft toasted In-N-Out bun with two slices of American cheese beautifully melted in between. Aug 28, We asked the BuzzFeed Community for their favorite In-N-Out secret menu What it is: This is basically a grilled cheese, but it's got beef patties. Sep 15, You won't find In-N-Out's grilled cheese on the menu, but ask and ye shall receive. Or, you know, make it yourself and skip the line. (Photos.