Combine sour apple schnapps, apple vodka and orange liqueur in a cocktail shaker. Add a little bit of ice and shake vigorously for a few seconds.
Divide the mixture between 4 champagne glasses.
Add about 3 oz. of champagne to each glass to fill it up. (Amount of champagne will depend on the size of your glass)
Notes
Champagne: Brut champagne is slightly less sweet than extra dry champagne, and much less sweet than dry champagne. If you do want ta touch more sweetness, use dry champagne. If you don’t have the option to use champagne, use dry prosecco. Prosecco is usually less sweet than champagne, and it also has fruity and floral hints of flavor as a delicious bonus!
Make Ahead: Mix the appletini ingredients together, which is everything except for champagne, in the cocktail shaker. (NO ice!) Close it and put it in the refrigerator until ready to use. Then ready, add a few ice cubes to the cocktail shaker, shake it well and then divide it among the glasses. Top it off with champagne and serve.