Preheat the oven to 350°F. Line a 9x13 baking sheet with parchment paper.
In a large mixing bowl, sift together the white cake mix and chocolate cake mix until well blended.
1 white cake box mix, 1 chocolate cake box mix
Add melted butter, eggs, and red food dye to the dry ingredients. Mix until the dough is smooth and a vibrant red color is achieved. Adjust the food dye as needed.
1 cup unsalted butter, 4 eggs, Red Food Dye
Cover the dough and refrigerate for 30 minutes to make it easier to handle.
Place powdered sugar in a shallow dish for rolling.
Powdered Sugar
Scoop dough into 1-inch balls and roll each ball generously in powdered sugar.
Place coated dough balls onto the prepared baking sheet, spacing them about 2 inches apart. Bake for 10-12 minutes, or until cookies are slightly puffed and crackled.
Allow cookies to cool for 5 minutes on the baking sheet, then transfer to a wire rack. Optionally, press heart sprinkles onto the tops while the cookies are still warm.
Heart Sprinkles
Serve once completely cooled. Store in an airtight container.