Preheat oven to 350°F. Line 2 baking sheets with parchment paper or lightly coat with non-stick spray.
In a large bowl, beat cream cheese and melted butter until smooth, about 2 minutes.
Add eggs and beat until just combined, avoiding overmixing.
Pour in the entire package of yellow cake mix, mixing until a cohesive dough forms.
Place powdered sugar in a shallow bowl. Form dough into 1-inch balls and roll each in sugar.
Arrange dough balls 2 inches apart on prepared sheets. Bake 9–11 minutes until edges are lightly golden and centers jiggle slightly.
Let cookies cool on the sheet for 5 minutes before transferring to a wire rack to finish cooling.
Notes
Always let cream cheese soften fully to achieve a smooth batter.If cookies spread too much, chill dough for 10–15 minutes before baking.Store cooled cookies in an airtight container at room temperature for up to 3 days or freeze for up to 3 months.