Allow the cream cheese to soften (come to room temperature). Leave it on the counter for about an hour before making the dip. Or soften it in your microwave.
In a medium bowl, combine the softened cream cheese, dried beef, green onions, sour cream, chives, garlic powder, Worcestershire sauce and black pepper. Use a spatula to stir until well combined. Or use an electric hand mixer.
Store the dip in an airtight container in the refrigerator for at least one hour, to allow the flavors to harmonize together.
This dip can be made up to one day in advance of serving.
Serve the dip with your favorite crackers and/or fresh cut veggies. You could also serve it in a pumpernickel or rye bread bowl, with bread cubes to dip.