In a large mixing bowl, beat together 1/2 cup of softened unsalted butter and 8 oz of cream cheese using an electric mixer on medium speed until smooth and creamy, about 2-3 minutes.

Mix in 1 large egg and 1 teaspoon of pure vanilla extract to the butter and cream cheese mixture, continuing to mix on medium speed until well combined, about 1-2 minutes.

Gradually add in the yellow cake mix, about a cup at a time, while mixing on low speed. Scrape the sides of the bowl as needed.

Cover the mixing bowl with plastic wrap and refrigerate for at least 30 minutes.

Preheat your oven to 350°F (175°C). Scoop out tablespoon-sized portions of dough and roll them into balls, then coat each ball in powdered sugar.

Place the dough balls on a lined baking sheet and bake for 10-12 minutes until edges are set but centers look slightly underbaked.

Let cool on the baking sheet for about 5 minutes before transferring to a wire rack.