01 - In a spacious mixing bowl, combine the ground turkey, egg, breadcrumbs, fresh parsley, Worcestershire sauce, garlic powder, onion powder, salt, and black pepper. Mix the ingredients gently until just incorporated, taking care not to overmix to maintain patty tenderness.
02 - Divide the turkey mixture into 12 equal portions. Shape each portion into a small patty, ensuring it is slightly larger than the slider buns to account for shrinkage during cooking.
03 - Preheat a grill or a large skillet over medium-high heat. Lightly brush the cooking surface with olive oil or spray with nonstick cooking spray to prevent sticking.
04 - Place the patties on the preheated cooking surface. Cook for 3 to 4 minutes per side, or until the patties are thoroughly cooked through and reach an internal temperature of 165°F (74°C).
05 - During the final minute of cooking, place a half-slice of cheddar cheese on top of each turkey patty. Cover the grill or skillet briefly to allow the cheese to melt perfectly over the patties.
06 - Lightly toast the slider buns on the grill or in a toaster until golden brown and slightly crisp.
07 - If desired, spread mayonnaise and Dijon mustard onto the bottom half of each toasted bun. Layer with fresh shredded lettuce, thinly sliced Roma tomatoes, a cheese-topped turkey patty, and a pickle slice. Crown each slider with the top half of the bun.
08 - Serve the turkey sliders immediately. For transport to an event, wrap them in aluminum foil to keep them warm.