Add the frozen fruit, caramel syrup, ice cubes, and milk into the blender.
Blend on high speed until the mixture is thick, smooth, and icy, with no large ice chunks remaining; this may take about 30-45 seconds.
Stop the blender and visually check that the mixture is creamy and evenly blended, with a slightly frosty appearance.
Pour the slushie into glasses, allowing the icy texture to mound attractively on top.
If desired, drizzle extra caramel syrup over the top for an appealing finish and additional sweetness.
Serve immediately with a straw and enjoy the chilled, caramel-infused refreshment.