Melt butter and mix with eggs in a large mixing bowl.
Stir cake mix into batter until well combined.
Mix in chocolate chips.
Spoon batter into pan.
Bake for 20-25 minutes, or until edges are golden brown.
Let cool before serving.
Notes
This Recipe Can be Doubled: This is a great recipe for events with individual snacks, such as bake sales or parties. Simply increase the ingredients proportionately and split into as many pans as you need.
Yellow Cake Mix: Stick to yellow cake mix to make these classic chocolate chip cookie bars. Yellow cake mix has added butter and egg yolks, giving it a rich taste perfect for a pan of cookies.
Baking Dish: Add the dough into a 9x13-inch baking dish and cut with a knife for customizable square sizes.