Line an 8x8" pan or baking dish with Reynolds Wrap® Heavy Duty Foil. - Set aside.
Combine the confectioner's sugar, butter, cream cheese, cocoa powder and vanilla in a mixing bowl.
Stir together on low speed until the dry ingredients start to blend with the butter and cream cheese.
Increase the speed and whip for about 30-60 seconds at high speed to make sure all of the ingredients are blended well.
Fold in your choice of mix-ins if using.
Spread out into the prepared pan.
Cover and refrigerate until firm - about 25-30 minutes.
Remove from the pan by lifting it up by the foil and slice into 1" squares using a sharp knife.
Transfer to a serving tray before the fudge warms and softens or cover with Reynolds Wrap® Heavy Duty Foil for storage.
Keep refrigerated when it is not being enjoyed.