Start by assembling all the ingredients on your kitchen counter. Make sure your banana is frozen and peeled.
In a blender, add the frozen banana, baby spinach, peanut butter (or PB2), almond milk, Greek yogurt, and protein powder if using.
Secure the lid on your blender and blend on high speed until all ingredients are combined and the mixture is smooth. If the smoothie is too thick, add a bit more almond milk until you reach your desired consistency.
Give your smoothie a taste. If you prefer it sweeter, consider adding a splash of honey or a few extra slices of banana.
Pour the Green Smoothie into a glass or Mason jar and enjoy immediately. You can also top it with a sprinkle of granola or some chia seeds for added texture!
Notes
Use frozen bananas for a creamy texture; fresh bananas may result in a thinner smoothie.
Adjust sweetness with honey, maple syrup, or extra fruit to suit your taste.
Store leftovers in the refrigerator for up to 24 hours; shake before drinking due to separation.