How to Make It
Heat a grill pan over medium-high heat. Lightly coat cut sides of buns with cooking spray. Place buns, cut sides down, in pan; cook 1 minute or until lightly toasted.
Combine pork, parsley, salt, and garlic powder in a medium bowl, gently mixing with hands. Divide mixture into 8 equal portions, shaping each into a 1/4-inch-thick patty. Lightly coat both sides of patties with cooking spray. Arrange patties in pan coated with cooking spray; cook 2 minutes. Turn patties over; top patties evenly with cheese. Cook 2 to 3 minutes or until cheese melts.
Combine lemon juice and avocado in a bowl; mash avocado with a fork, and stir to combine. Spread avocado mixture evenly over bottom halves of buns. Place 1 patty on each bottom bun. Top each with 1 tomato slice and 1 lettuce leaf. Top with top halves of buns. Serve immediately.