Slice the vanilla bean in half and scrape out the seeds.
If you want, rim the flute with a lemon wedge and dip it in sugar.
Add 1 tablespoon vanilla simple syrup and the seeds from half the vanilla bean to your glass.
Pour in 1 ounce vodka if you’re doing the stronger version.
Stir gently to mix up the syrup, seeds, and vodka (if using).
Hold the glass at an angle and slowly fill with Prosecco—keeps the bubbles under control.
Give it all a gentle stir so the flavors come together.
Finish with a curl of lemon or orange peel, an edible flower, or a little mint, if you like.