Bake in a preheated 350°F oven for 15 minutes or until crispy.
While bacon is in the oven, sautee onions until lightly browned. Remove from heat.
Separate beef into 8 even sized portions.
Flatten each into thin patties and sprinkle with salt and pepper.
Top half of the patties with shredded cheese and one small block of cheese, about ¼ inch by ½ inch.
Top each with the remaining patties and press the edges together to seal it.
Heat your cast iron skillet, add butter and cook burger patties 10-15 minutes, total, flipping once.
Assemble your burger, add the bacon to the bottom of the bun, top with burger, onion and your favorite sauces.
Notes
This is a pretty easy recipe, but it does have a lot of steps. Please refer to Step-by-Step images in the post above for visual reference!
I like to add a small chunk of cheese in addition to the shredded cheese. Shredded cheese melts quicker, and the small hunk gives it some girth and extra cheese as you take your first bite.
Make sure you seal the edges of the top and bottom burger patty well. It's not a huge deal if some cheese escapes, but we want to minimize it as best as possible.
Cook low and slow to ensure the cheese melts and the meat cooks through. Always check the internal temperature of meat before consuming.
Flipping the patty once will result in a juicier and tastier burger.
Nobody wants a soggy bun, and toasting only takes a minute.