Slice the chicken breasts in half lengthwise to create thinner cutlets. In a bowl, combine the olive oil, garlic powder, salt, and pepper. Add the chicken cutlets and toss to coat. Let marinate for at least 15 minutes.
Heat a grill pan or outdoor grill to medium-high heat. Cook the chicken cutlets for 4-5 minutes per side, until they have nice grill marks and are cooked through.
During the last minute of cooking, place a slice of cheddar cheese on top of each chicken breast. Cover the pan or grill to allow the cheese to melt.
Meanwhile, halve the hamburger buns and toast them in a dry skillet or lightly brushed with olive oil until the insides are golden brown.
Halve the avocados, remove the pits, scoop the flesh into a bowl, and mash with a fork. Add the fresh lime juice, salt, and pepper, and mix well.
Prepare the vegetables: slice the tomato and red onion into thin rings.
Spread a little mayonnaise on the inside of the toasted buns, then layer the avocado cream on the buns.
Assemble the burgers: place a lettuce leaf on the bottom bun, followed by the cheesy chicken breast, tomato, and red onion. Top with the other half of the bun.
Serve immediately, preferably with sweet potato fries or a fresh salad. Tip: For an extra creamy avocado flavor, stir in a little sour cream or Greek yogurt!
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