Grease pan (rub small amount of oil/butter or pan spray).
Preheat oven 350 degrees.
Melt butter. Microwave about 30 seconds or you can melt in saucepan.
In large mixing bowl, combine cake mix, melted butter and 2 eggs.
Mix with hand beater until dough forms.
Add 1 cup (or more if desired) white chocolate chips. Hand in white chocolate chips.
Hand mix in white chocolate chips.
From here you have 2 options.
Option 1 (preferred): Refrigerate dough for about 30 minutes. This allows it to firm up and makes it easier to shape into balls resulting in a more uniform cookie shape.
Option 2: Move directly to next step skipping refrigeration. The dough will be a little more sticky and harder to shape. Your cookies will be less uniform. This option is fine if you need to save time.
Shape cookies into balls (about size of a golf ball). Top with a few more white chocolate chips, if desired.
Place cookies on sheet pan. They will expand. Put 6-9 cookies per pan.
Option 1: Bake 12-14 minutes.
Option 2: Bake 10-12 minutes.
Allow time to cool before removing from cookies sheet.