Prep the Fruit: Wash your strawberries and cut off the green leafy tops. If the berries are large, slice them in half.
Blend the Puree: Put the strawberries and powdered sugar into your blender. Pulse until the mix is completely smooth.
Strain (My Pro Tip): If you dislike strawberry seeds, pour the puree through a fine-mesh strainer into a small bowl. Use the back of a spoon to push it through. This makes your strawberry bellini cocktail recipe look very professional.
Chill the Puree: For the best results, put the strawberry mix in the fridge for 10 minutes. A cold base helps keep the bubbles from disappearing too fast.
Assemble the Drink: Spoon about 1 to 2 tablespoons of the strawberry puree into the bottom of a champagne flute.
Add the Bubbles: Slowly pour the chilled prosecco into the glass. The mix will foam up, so take your time.
Stir Gently: Use a long spoon to give it one very gentle stir. You want to pull the fruit up from the bottom without losing the fizz.
Garnish: Slip a small strawberry slice onto the rim of the glass and serve right away.