Fill a cocktail shaker with ice; add vodka and cranberry. Shake vigorously.
Strain vodka and cranberry juice mix into a martini glass. Top the cocktail with a splash of champagne (about 1 oz, depending on the size of your martini glass).
Garnish with an orange slice, if desired.
Recipe by Helpful Homemade at https://helpfulhomemade.com/bonefish-martini/