Pinch of sea salt, if using unsalted peanut butter
3handfuls of ice cubes
Combine all of the ingredients, except for the ice, in a high-speed blender and blend until the seeds are completely broken down. Add in the ice and blend again to create a thicker shake that's cold and creamy. Serve immediately.
If you don't have a high-speed blender, I'd recommend soaking the chia seeds and dates in the water at least 20 minutes ahead of time, or even overnight, to help them break down in the blender easier.