In a large bowl combine the bacon, ground beef, Ranch mix, cheese, sour cream and pepper.
Form the beef into 8 equally-sized balls, about 4 ounces each.
Fire up your grill for medium-high heat. Place a griddle or a large cast-iron pan over the highest heat.
Add the onion to the griddle.
Add the onion slices and cook 5-10 minutes or until just softened. Remove to a plate.
Place the balls of beef on the griddle and let cook for one minute. Just let them cook, don’t mess with them.
Take your press and flatten out the patties. I like to use the point of the press and work my way around the ball first, doing a little section at a time and then finally I press down on the entire patty to flatten it out. You can also just flatten out the ball all at once. At this point I also like to season the patties some more.
Let the patties cook until you start to notice a little char along the edges. Flip, season again if desired, and continue cooking another minute or so until the other side is charred. The burgers are thin so they will cook very quickly so watch out.
Top patties with cheese and let cook another 30 seconds to melt the cheese. Remove.
Toast the buns. Remove and slather with mayonnaise.
Add lettuce to bun bottoms. Add patties to bottom buns, top with onions, and serve!
Notes
For a little kick, add a minced seeded jalapeno to the ground beef mixture before forming into balls.