Place avocado, lime juice, and cilantro in a small bowl and mash well with a fork until smooth. Season with salt and pepper to taste. Set aside.
In a medium bowl, combine ground beef, garlic, salt, and pepper. Form meat into 4 uniform patties.
Place bacon in a large skillet and set over medium heat. Cook bacon until crispy, turning occasionally. Drain bacon on paper towels.
Preheat a grill to 400F or if cooking indoors, heat pan with bacon drippings over medium-high heat. Grill or pan sear burgers flipping once until burgers reach your desired degree of doneness (see blog post for more info on this)
Assemble burgers by placing a lettuce leaf on each bun and spreading mashed avocado on top. Top with burger patty, a slice of mozzarella, a strip of bacon, and red onion. Serve burgers warm and enjoy!
Notes
Storing InstructionsBurgers are best if served immediately after assembly.