Add the chilled milk, sugar, vanilla extract, and fresh berries to the blender.
1 cup milk, 2 tablespoons sugar, 1/2 cup fresh berries or fruit, 1 teaspoon vanilla extract
Pulse or blend on low speed to combine the ingredients until the sugar dissolves and the berries are slightly broken down, about 10-15 seconds.
Add the ice cubes to the blender and start blending on high speed.
1 cup ice cubes
Blend until the mixture is thick, frosty, and smooth, about 30-40 seconds. You should see a slushy texture forming, with the ice breaking down into tiny, crunchy bits.
Check the consistency—if it’s too runny, add a few more ice cubes and blend again for a few seconds.
Once the mixture is icy and scoopable, transfer the slushie into glasses or a chilled container.
Serve immediately with a straw or spoon to enjoy its crunchy, frozen texture.