Chill the glass, Prosecco and peach puree in advance.
(Optional) Blend peaches (fresh, frozen or canned) into a puree consistency.
Pour peach puree (or nectar) into a champagne flute.
Gradually add Prosecco over the puree.
Stir gently to mix while maintaining the bubbles.
Garnish with a peach slice for an elegant finish.