Form ground beef into three ⅓ pound patties and place in a shallow dish.
In a small bowl combine marinade ingredients: brown sugar, ground mustard, seasoned salt, onion powder, pepper, red pepper flakes, olive oil, balsamic vinegar, low sodium soy sauce, Worcestershire sauce, minced ginger, and minced garlic. Stir to combine.
Pour marinade over beef patties. Use a spatula to lift the edges of the beef patties so that marinade flows beneath the patties.
Cover and refrigerate for 8 hours or overnight.
Preheat grill and cook patties for 6-8 minutes per side or until beef is cooked through to desired doneness. Discard excess marinade.
Top each patty with a slice of cheddar cheese and continue to cook until cheese melts; about 1-2 minutes.
While beef patties cook cut bacon strips in half and fry until crisp; drain cooked bacon on a paper towel lined plate.
Mash avocado. Set aside.
Toast ciabatta rolls on the grill until lightly golden brown.
Spread mashed avocado onto one half of toasted ciabatta roll. Place grilled beef patty on the other half of toasted ciabatta roll.
Top beef patty with bacon, sliced tomato, red onion, and lettuce leaves.
Serve with ketchup and mustard if desired.