Heat a skillet over medium heat and add in the butter.
Slice the chipped beef into strips and add to the pan. When the butter melts, stir and sauté the beef for 1-2 minutes. Reduce heat to medium low.
Add in worcestershire sauce, stir. Add in heavy cream and water and stir. Add in black pepper if using.
In a small bowl, add 2 Tablespoon of cream and ¾ teaspoon of xanthan gum. Mix together until it forms a paste. Add to creamed chip beef and stir to thicken it.