Place ground turkey into a large bowl. Add onion, garlic, parsley, Worcestershire sauce, olive oil, salt, and pepper. Mix everything gently using your hands until all ingredients combine evenly together.

Divide the turkey mixture into four equal portions. Shape each portion into round burger patties. Press the center lightly using your thumb to help the burgers cook evenly.

Place a grill pan or skillet over medium heat. Add a small amount of olive oil. Allow the surface to heat properly before placing the turkey patties inside.

Carefully place the patties onto the hot pan. Cook them for five minutes without pressing down. This helps keep the burgers juicy and creates a golden crust.

Turn the turkey burgers using a spatula. Cook the second side for another five to six minutes until fully cooked. The inside should no longer appear pink when finished.

Add cheese slices during the final cooking minute if desired. Cover the skillet briefly to melt the cheese perfectly over the warm turkey burger patties.

Slice the burger buns in half carefully. Toast them lightly on the skillet for one minute. Toasted buns add extra crunch and hold the juicy burgers better.

Spread mayonnaise or burger sauce on the toasted buns. Add lettuce, tomato slices, and cooked turkey patties. Cover with the top bun and serve immediately warm.