Mince shrimp by hand or in a food processor until coarsely chopped. Transfer to a mixing bowl along with scallions, parsley, panko, mayonnaise, egg, Old Bay, Worcestershire, salt and black pepper. Mix well.
Form into 12 even-sized cakes.
Chill in the refrigerator for 1 hour or in the freezer for 20-30 minutes.
Preheat oven to 325 degrees. Place a rack over a baking sheet.
Place approximately 1/4-inch of oil in a skillet or saute pan. Heat over medium-high until shimmering.
Dredge the shrimp cakes in panko and, working in batches, carefully place them in the hot oil. Brown 2 minutes per side or until golden. Place shrimp cakes on the rack set over a baking sheet. Repeat until all the cakes are browned.
Place in the oven and bake 8-10 minutes or until cooked through to 165 degrees in the center.