Put as much as you want on the inside of both buns.
Burger:
Toast both buns using olive oil on medium heat skillet.
Apply generous amounts of salt and pepper to both sides of patty.
Place patty on skillet set to medium-high. Set onions on top of patty and firmly press patty flat onto the skillet.
Cook for 1m30s minutes or to desired doneness.
Flip. Place layer of jalapenos, followed by American cheese, followed by cheddar cheese.
Cook for 1 minute.
Remove from heat and cover. Let sit for 45 seconds.
Sauce bottom bun, place patty, sauce top of patty, cover with top bun.
Use ½ lb of ground beef and divide into 2 patties. Top first patty with jalapenos and American cheese. Top second patty with cheddar. Apply onion method to first patty.