Mix cake mix and powdered sugar together in a large microwaveable bowl. Then room temperature butter and milk. You don't have to stir. Place in microwave and cook on high for 2 minutes.

Mix all ingredients together until they're fully combined, then stir in chocolate chips Lightly grease or line an 8x8 pan with wax paper. Press fudge into pan and refrigerate for approximately 2 hours or until fudge is set. When set, fudge can be stored at room temperature.