Slice the chicken breasts in half horizontally to create thinner cutlets. In a bowl, combine the olive oil, lemon juice, garlic powder, smoked paprika, salt, and pepper. Rub the mixture all over the chicken cutlets and let them marinate for at least 15 minutes.
Preheat a grill pan or outdoor grill to medium-high heat. Grill the chicken breasts for 4-5 minutes per side, until they have nice grill marks and are cooked through.
During the last minute of grilling, place a slice of cheddar cheese on top of each chicken cutlet. Cover the pan or grill to allow the cheese to melt.
Meanwhile, halve the burger buns and toast them in a dry skillet or lightly brushed with olive oil until golden brown on the cut sides.
Prepare the vegetables: slice the tomato and red onion into thin rounds.
In a small bowl, whisk together the mayonnaise and Dijon mustard. Spread the mixture on the cut sides of the toasted buns.
Assemble the burgers: Place lettuce leaves on the bottom bun, followed by the cheesy chicken breast, tomato slices, and red onion rings. Top with the other half of the bun.
Serve immediately, preferably with roasted sweet potatoes or a fresh side salad. Tip: For extra juicy chicken, marinate for up to an hour in the refrigerator.
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