Measure out the ice cubes, caramel syrup, and milk, keeping everything ready for blending.
Add the ice cubes to the blender, filling it about halfway to create a frosty base.
Pour the caramel syrup over the ice, distributing it evenly to ensure sweet flavor throughout.
Pour in the milk, which will help blend everything into a smooth, creamy consistency.
Secure the lid on the blender, then blend on high speed for about 30-60 seconds until the mixture is thick, frosty, and well combined.
Stop the blender and check the consistency; it should be smooth yet slightly chunky from the ice, with a glossy caramel color.
Pour the caramel slushie into glasses, and if desired, garnish with a drizzle of extra caramel or a sprinkle of coarse sea salt for added flavor.
Serve immediately with a straw and enjoy the icy, luscious treat.