01 -
Shape the ground chuck into loose balls around 1/3 of a pound. Chill them in the fridge for about 30 minutes to let them stiffen.
02 -
Using a mandoline slicer, carefully cut the onions so they're super fine. Press out any extra liquid and keep them cold until it's time to cook.
03 -
Cook thick slices of bacon until they're crunchy and brown. Cut into small chunks for both the bacon sauce and toppings.
04 -
Mix mayo, mustard, ketchup, crumbled bacon, Worcestershire, vinegar, spice mix, and chili flakes in a bowl. Stir well and set aside.
05 -
Get your griddle extra hot and coat it lightly with avocado oil. Place your chilled meat balls on the griddle, giving space in between. Add onion slices on top, firmly smash with a spatula, and season each with salt, pepper, and garlic powder.
06 -
Let them cook for about 3 minutes, until crusty. Brush the top of the patty with yellow mustard, flip, lay on pepper jack slices, and cook until the cheese melts (around 3 more minutes).
07 -
Briefly toast the buns on the griddle. Spread the bacon-mayo mix on the lower bun, stack two patties on it, add some more sauce, and place the top bun. Serve hot, so they're fresh!