Slice the chicken breasts horizontally to create thinner cutlets. In a bowl, combine the olive oil, garlic powder, salt, and pepper. Toss the chicken slices in the mixture and let them marinate for at least 15 minutes.
Heat a grill pan or outdoor grill to medium-high heat. Cook the chicken slices 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.
In a skillet, melt the butter and sauté the sliced mushrooms for 4-5 minutes, until golden brown. Add a pinch of salt and pepper to taste.
Meanwhile, halve the hamburger buns and toast them in a dry pan or lightly brushed with olive oil until golden brown on the inside.
Prepare the vegetables: slice the tomato and red onion into thin rings.
Spread a little mayonnaise on the inside of the toasted buns.
Assemble the burger: place a lettuce leaf on the bottom bun, followed by the cheesy chicken breast, sautéed mushrooms, tomato, and red onion. Top with the other half of the bun.
Serve immediately, preferably with french fries or a fresh salad. Tip: For a more intense flavor, use porcini or other wild mushrooms instead of cremini mushrooms!
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