Place the cheeses in a small pot over medium heat. Let the cheeses start to melt, stirring every few minutes. Then add the jalapeno, garlic, seasoning salt, and worcestershire sauce. Stir until completely melted and smooth, then pour into a small baking dish. (8x8 or slightly smaller). Sprinkle the panko crumbs over the cheese mixture.
To serve right away, broil on high for 3-5 minutes until bubbly and browned on top. To serve later, refrigerate covered until ready to use and bake uncovered at 375F until hot, bubbly, and browned on top.