Pour the chilled champagne into the blender, followed by the fruit juice or puree, and add the sugar if using.
1 bottle champagne
Add the ice cubes to the blender to create a frosty base for the slushie.
1 bottle champagne
Blend everything on high speed until the mixture is smooth, thick, and slushy with a fizzy sparkle.
Taste the mixture and add more sugar if desired, then briefly blend again to incorporate.
1 bottle champagne
Pour the slushie into chilled glasses, allowing the icy, bubbly beverage to fill each glass evenly.
Garnish with a slice of fruit or a sprig of mint if desired, and serve immediately for the best frosty, fizzy experience.
1 bottle champagne