Assemble ingredients, toast halves of roll under broiler, remove set aside.put roast beef slices on microwave safe plate, place cheese on top and put setting on 20 seconds to melt cheese. Put ranch dressing on each half, place spinach leaves on bottom, then onion slice, then roast beef and cheese. Put your top on and dig in.
This sandwich is great hot or cold the amount of ingredients are for each sandwich you make. Watching your waistline?? Go low cal, low sodium and adjust accordingly, Enjoy.