To a blender add in whole milk, chocolate chips, chocolate sauce, instant coffee, xanthan gum, and ice.
Blend together until the Frappuccino is smooth and creamy.
To a serving cup, add whipped cream and half of the crushed Oreo cookie crumbles.
Pour in the blended Frappuccino over the whipped cream and cookie crumbles.
Top the drink with more whipped cream, the remaining crushed Oreo cookie crumbles, and a drizzle of chocolate sauce.