Pork Sliders with Smashed Avocado

For smaller sandwiches like these, we prefer to mash the avocado before assembling, so that the slippery slices don't get lost on the way from the plate to the mouth.
Preheat a grill pan over medium-high heat. Lightly brush the cut sides of the buns with cooking spray. Place the rolls, cut side down, in the pan; cook for 1 minute or until lightly browned.Combine the pork, parsley, salt, and garlic powder in a medium bowl, stirring gently with your hands. Divide the mixture into 8 equal portions, forming each into a 1/4-inch thick patty. Lightly brush both sides of the cutlets with cooking spray. Place the patties in a skillet covered with cooking spray; cook for 2 minutes. Turn the patties over; sprinkle evenly with the cheese. Cook for 2-3 minutes or until the cheese is melted.Combine the lemon juice and avocado in a bowl; mash the avocado with a fork and mix until smooth. Spread the avocado mixture evenly over the bottom halves of the buns. Place 1 pie on each bottom bun. Top each with 1 slice of tomato and 1 lettuce leaf. Top with half buns. Serve immediately.