Recipe for Broccoli Gratin with Swiss and Parmesan (plus 10 More Broccoli Recipes for Thanksgiving)

(For Phase One Fridays I highlight Phase One recipes from the past that have been my personal favorites.  This Broccoli Gratin with Swiss and Parmesan is one of the ways I regularly cook broccoli for a special occasion, and it's always a hit.) It's November, so the focus is on Thanksgiving Recipes.  Today's recipe is adapted from one I saw in A Pinch of Salt Lake, a book publish