Add cake mix, melted butter and eggs to a large mixing bowl. Stir or mix with a hand mixer until smooth. Mix in white chocolate chips.
Scoop 2-tablespoon size balls of cookie dough onto a cookie sheet lined with parchment paper or silicone mat. No needs to space; you’re going to chill the dough. Chill for at least 1 hour.
Preheat oven to 350°F. Line a second cookie sheet with parchment paper or silicone. Spread out cookies 2-inches apart on cookie sheets (see note). Bake 10-15 minutes or until they just lose their glossy sheen. They stay pretty puffed up and will settle a bit as they cool.
Optional: press more white chocolate chips into the tops of the cookies as soon as they come out of the oven. Let cool before removing from pan or stacking.
Store in an airtight container for up to 3 days or freeze for up to 2 months.
Video
Notes
Betty Crocker cake mix is what I used. If you use Duncan Hines cake mix be sure to spread your cookies out a bit more as the Duncan Hines brand spreads more.