In a small bowl, combine cream cheese, mayonnaise, cheddar cheese, Worcestershire sauce, garlic powder, onion powder, Kosher salt and white pepper. Mix until well combined. You can use an electric mixer or stand mixer for this portion.
Fold in crab meat.
Fill each mushroom cap with a heaping portion of crab filling.
Top each with a pinch of panko bread crumbs, tapping them down into the filling to stick.
Bake for 12-13 minutes or until panko start to brown.
Remove and top with chopped scallions or chives. Serve hot.
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