Start by gathering all your ingredients before blending. Measure the frozen blueberries, milk, and almond butter so everything is ready to go. Using frozen blueberries is important because they create the thick and creamy texture.
Place the blueberries, milk, and almond butter into a high-speed blender. Make sure the liquid goes in first because it helps the blender run smoothly and prevents the mixture from getting stuck.
Blend the mixture on high speed for about 20–30 seconds. Continue blending until the smoothie becomes completely smooth and creamy with no visible chunks.
If the smoothie feels too thick, add a small splash of milk and blend again. If you want it thicker, you can add a few ice cubes or extra frozen blueberries.
Pour the smoothie into glasses immediately after blending. Serve it fresh while it’s cold and creamy for the best flavor and texture.