In a blender, add blueberries, maple syrup, almond butter, milk, baby spinach, and a pinch of salt.
Blend on high speed until the mixture is smooth and creamy. If the smoothie is too thick, add more milk, a little at a time, until desired consistency is reached.
Taste the smoothie and adjust sweetness if needed by adding more maple syrup.
Once blended to your liking, pour the smoothie into glass or to go cup.