In a bowl, prepare burger pattie meat by combining all ingredients until well incorporated. Divide into 4 equal portions measuring ¼ pound each. Refrigerate until ready.
For Guacamole, mash avocado with fork until chunky, do not make smooth. Add remaining ingredients and mix to incorporate.
Preheat your grill pan/griddle on Medium-High for 5 minutes or until smoking.
Place patties on griddle and cook for 4-6 minutes on each side or until desired cook on pattie. Place cheese slice on patties on the first flip.
Meanwhile, spread mayo on buns and place on griddle to warm and toast.
To assemble, place patty on bottom bun, followed by Guacamole and topped with shredded lettuce.