Heat oven to 375°F. Lightly grease 2, 8-inch round pans.
Measure pancake mix by lightly spooning it into measuring cup and leveling it off.
In medium bowl, stir together pancake mix and buttermilk, mixing to form a dough.
Turn dough out onto work surface dusted with pancake mix. Gently roll out dough to approximately 1/4” thickness (approximately 18” x 14”).
Spread honey mustard sauce evenly over dough, then top with shredded Gruyere and slices of ham.
Roll dough and filling up from the long side (like a cinnamon roll), working carefully to keep a fairly tight roll and to loosen dough that may be sticking to the surface.
Gently cut into 12 equal size rolls, ~1 ½” thick. Place 6 rolls into each prepared pan.
Bake 23 - 25 minutes or until light golden brown.
Sprinkle with additional cheese and diced green onions, if desired. Serve warm with additional honey mustard sauce.