Brew a cup of coffee and allow it to cool to room temperature, or chill it in the refrigerator for a quicker approach.
Add the cooled coffee into a blender along with the ice cubes and sweetener. This combination will form the icy base of your slushie.
Blend on high speed until the mixture is smooth and ice is finely crushed, resembling a thick slush or sorbet texture. You should hear a consistent blending sound with no large chunks.
Stop the blender and check the texture; if it’s too thick, you can add a splash more coffee or a little water, then blend briefly to incorporate.
Pour the blended coffee slushie into glasses, creating a mound of icy goodness that holds its shape and looks invitingly frosty.
If desired, garnish with a coffee bean or a sprig of mint for visual appeal before serving immediately with a straw or spoon.
