Slice the chicken breasts in half horizontally, but not all the way through, creating a pocket for the filling.
In a bowl, combine the grated cheddar cheese, cream cheese, and chopped parsley. Stuff the chicken breasts with this mixture, pressing the edges together to seal in the filling.
In another bowl, whisk together the olive oil, garlic powder, salt, and pepper. Brush the mixture all over the outside of the stuffed chicken breasts.
Heat a grill pan or outdoor grill to medium-high heat. Cook the chicken breasts for 5-6 minutes per side, or until golden brown and the cheese is melted and gooey.
Meanwhile, halve the burger buns and toast them in a dry skillet or brushed with a little olive oil, until golden brown on the cut sides.
Prepare the vegetables: slice the tomato and red onion into thin rings.
Spread a little mayonnaise on the cut sides of the toasted buns.
Assemble the burgers: place a lettuce leaf on the bottom bun, followed by the stuffed chicken breast, tomato slices, and red onion rings. Top with the other half of the bun.
Serve immediately, preferably with fries or a fresh salad. Tip: For an extra crispy crust, coat the chicken in breadcrumbs before grilling!
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