Prepare the Ingredients: If you haven't already done so, peel the ripe banana, break it into chunks, and freeze them overnight. Freezing the banana adds creaminess to the smoothie and eliminates the need for ice cubes. Measure out the frozen berries, fresh spinach or kale leaves, almond milk or coconut water, dairy-free yogurt, chia seeds or ground flaxseeds (if using), and sweetener (if using).
Blend the Ingredients: In a blender, combine the frozen banana chunks, mixed frozen berries, fresh spinach or kale leaves, almond milk or coconut water, dairy-free yogurt, and chia seeds or ground flaxseeds (if using). If you prefer a sweeter smoothie, add the maple syrup or agave nectar to the blender. Optional: Add a few ice cubes to the blender for a colder smoothie. Blend on high speed until smooth and creamy, scraping down the sides of the blender as needed to ensure all ingredients are well incorporated.
Adjust Consistency and Taste: If the smoothie is too thick, add a splash more almond milk or coconut water and blend again until you reach your desired consistency. Taste the smoothie and adjust the sweetness if necessary by adding more maple syrup or agave nectar.
Serve and Enjoy: Pour the vegan smoothie into glasses and serve immediately. Garnish with fresh berries, a sprinkle of chia seeds or ground flaxseeds, or a drizzle of maple syrup if desired. Enjoy the creamy, fruity goodness of this homemade vegan smoothie as a refreshing breakfast, snack, or anytime treat.