Combine the Cheese Mixture: In a mixing bowl, add 8 oz of softened cream cheese, 1 cup of shredded cheddar cheese, and 1/2 cup of grated Parmesan cheese. Mix well using an electric mixer until all the cheeses are uniformly blended.
Add Flavorings: Add 1/2 cup of finely chopped green onions, 1 teaspoon of garlic powder, 1/2 teaspoon of onion powder, 1/2 teaspoon of salt, and 1/4 teaspoon of black pepper to the cheese mixture. Stir the ingredients until they are well incorporated.
Form the Cheese Balls: Using your hands, scoop a tablespoon of the cheese mixture and roll it into a ball, about 1 inch in diameter. Repeat until all the mixture is used, ensuring your hands are slightly damp to avoid sticking.
Coat the Cheese Balls: Take 1/2 cup of finely chopped walnuts and place them on a plate. Roll each cheese ball in the walnuts until they are completely coated. This step adds crunch and enhances the flavor.
Chill to Set: Once all cheese balls are coated, place them on a plate and refrigerate for at least 30 minutes to allow them to firm up.
Garnish and Serve: Before serving, sprinkle fresh chopped parsley on top of the cheese balls for an added touch of color and flavor. Enjoy your delicious appetizer!