Start by making your coffee the night before. Brew 1 cup of coffee and let it cool completely before storing it in the fridge. This saves you time in the morning and ensures your smoothie isn't warm.
When you're ready to make your smoothie, grab your blender and measuring tools. Pour the cold coffee into your blender first, followed by the milk of your choice.
Next, add your banana (fresh or frozen), chia seeds, peanut butter or almond butter, vanilla extract, and cinnamon. If you want it a bit sweeter, add the honey or maple syrup now.
Add the ice cubes last. This helps push all the other ingredients down toward the blades.
Blend everything on high speed for about 45-60 seconds until the smoothie looks creamy and smooth. If you notice any chunks of banana or ice, blend for another 15-20 seconds.
Stop and check the thickness. If it's too thick, add a splash more milk or coffee. If it's too thin, add a few more ice cubes and blend again.
Pour your smoothie into a tall glass right away. If you like, sprinkle a little extra cinnamon and chia seeds on top for decoration.
Drink your smoothie immediately for the best taste and texture. The chia seeds will continue to thicken the smoothie over time, so it's best enjoyed fresh.