Slowly pour the chilled prosecco or champagne into the flute.
Stir gently with a bar spoon to mix the juices.
Garnish with an orange slice and 2-3 fresh cranberries.
Notes
The best results come from using fresh-squeezed orange juice rather than store-bought.Store-bought cranberry juice works well, but pick 100% juice instead of cocktail blends.Keep all ingredients cold before mixing for the best taste and most bubbles.Make a pitcher version by multiplying the recipe by 6-8 servings and mixing just before guests arrive.Swap prosecco for champagne based on budget and taste preferences.