Place the sliced peaches into the blender.
Add the crushed ice to the blender with the peaches.
Blend everything on high speed until the mixture is smooth, frosty, and evenly combined, about 30-45 seconds.
Stop the blender and check the texture—add more crushed ice if you want a thicker, colder slushie, then blend briefly to incorporate.
Pour the blended peach slushie into glasses, watching the bright pink hue swirl around.
Serve immediately with a straw or a fresh peach slice for garnish, enjoying the cool, juicy texture.