Combine the softened cream cheese, shredded cheese, mayonnaise, garlic powder, and onion powder in a large bowl and stir together until completely combined.
Cover and chill for 15 minutes.
In a smaller bowl, combine the chopped pecans, chopped pistachios, bacon bits, and parsley. Stir to combine.
Once the cheese mixture has chilled, roll it into tablespoon-sized balls and then roll in the nut mixture to coat.
Insert a pretzel stick into each mini cheese ball and then chill on a tray until ready to serve.