Season one side of the burger with salt, pepper and garlic. Place on
grill or in broiler, seasoned side down. Then season the other side.
Cook to desired doneness.
While burger is cooking, melt butter in fry pan on medium heat or in
electric skillet (set at 350 degrees). Spread mayonnaise onto bread.
Drop bread, dry side down, onto melted pools and swirl to coat (to
Cover one slice of bread with two slices of Swiss cheese and the other
with two slices of Cheddar.
In a separate frying pan, melt butter and sauté sliced onions.
Season with salt, pepper and garlic while heating.
Place cooked burger patty on top of one cheese-topped slice of bread
and the sautéed onions on the other. Carefully close and cut sandwich.