Meanwhile, combine the cream cheese, mayonnaise, sour cream, lemon juice, garlic powder and a few grinds of pepper together in the work bowl of a stand mixer. Using the whisk attachment mix until light and fluffy, about 3 minutes, scraping down the sides of the bowl as necessary. Add the chopped dill and mix again until it is evenly dispersed throughout the mixture. Add salt and pepper to taste. (Alternatively, use a hand mixer or whisk by hand. See note below).