Add remaining ingredients up to the buns. Using your hands, gently mix everything together. You want the ingredients to be distributed evenly throughout but try to not overwork the chicken.
Form chicken into 4 equally-sized patties. They'll end up around 5 ounces each.
Grill burgers for 5-7 minutes per side or until temperature reaches 165 F as measured in several spots.
Toast buns as desired.
Slather cut sides of buns with guacamole. Now is not the time to be shy with it.
Add patties and any other desired toppings and serve.
Notes
Don't be tempted to smash these burgers like you would beef burgers. The chicken won't hold up to the pressure! Just put them on the grill and leave them alone for 5-7 minutes per side, flipping them gently when it's time to flip them!