Put in the oven, and watch the cooking: it's done when cheese is melted and slightly toasted (about 10-15 minutes ). Serve immediately, if possible with a salad and French dressing (vinaigrette).
Remarks
The same recipe as been tested in a wood-fired oven, it's better and takes only half (or a third) the time.
You can also use cheese other than Morbier, I think that any soft-paste might be tried, e.g. reblochon or Mont d'Or.