Boozy Screamsicle Shakes

Pour 2 tablespoons chocolate sauce onto a small, shallow plate. Place Oreo crumbs on a second small plate. Dip rims of serving glasses first in chocolate sauce, then in Oreo crumbs.  Combine sherbet, milk, and vodka in a blender and blend to combine. Drizzle some chocolate sauce on the inside of each serving glass, then fill with milkshake. Garnish with whipped cream, remaining Oreo crumbs, and sprinkles.