Preheat the oven to 220°C. Line a baking sheet with foil.
Lay the bacon slices in a single layer on the prepared baking sheet. (It's OK if they overlap a little.) Bake until browned but still pliable, 15 to 18 minutes. Transfer the bacon with tongs to a paper towel-lined plate.
Meanwhile, whisk together the mayonnaise, sour cream, chives, garlic powder, onion powder and Worcestershire sauce in a small bowl until combined; set aside.
Set up a breading station with the flour in 1 medium bowl, the beaten egg with a splash of water in another medium bowl and the panko in a third. Generously season the chicken pieces with 1/4 teaspoon each salt and pepper. Dredge the tenders in the flour a few pieces at a time. Tap off the excess flour before dipping the tenders into the egg. Allow the excess egg to drip off, then coat the tenders in the panko. Set the breaded pieces on a plate. Repeat until all the tenders have been coated.
Heat the oil in a large skillet over medium heat, then add the chicken in a single layer. Cook until browned on the bottom, about 3 minutes, then flip. Cook until the chicken is cooked through and browned on the other side, 3 minutes more. Transfer to a wire rack or paper towel-lined plate.
Lay out a flatbread with the shorter side facing you. (If your flatbread seems dry, moisten it slightly with a damp paper towel.) Spread half the ranch dressing on the bottom third. Line the wrap with half the bacon strips, then add half the chicken crosswise. Top the chicken with 2 pieces of lettuce, also crosswise. Starting from the bottom, roll everything up into as tight a spiral as possible without ripping the wrap, leaving the seam on the bottom. Place toothpicks into the roll at 1-inch intervals all the way through to the bottom to secure everything in place. Cut, in between the toothpicks, into even slices. Repeat with the remaining flatbread.
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