- Pour the chilled champagne into the blender jar. 
- Add the ice cubes to the blender, distributing evenly over the liquid. 
- Drizzle in the simple syrup for sweetness, adjusting based on your preference. 
- Pulse the blender a few times to start crushing the ice and mixing the ingredients gently. 
- Blend on high until the mixture is smooth, icy, and slightly slushy, about 30-45 seconds. 
- Turn off the blender and check the texture—the drink should be bubbly, cold, and fluffy. 
- Scoop the champagne slushie into chilled glasses and garnish with a twist of lemon or a small sprig of mint if desired.