Measure out frozen mixed berries and place in the blender. Peel and roughly chop the banana; add to blender. Measure the almond milk and Greek yogurt and set near the blender.

If you prefer a thinner smoothie, use a little more almond milk (increase by 2–4 tablespoons). If your berries are only partly frozen, add 4 ice cubes to the blender.

Blend

Add liquids and flavorings

Pour the almond milk and Greek yogurt over the fruit in the blender. Add honey or maple syrup, vanilla extract, and fresh lemon juice.

Add boosters

Sprinkle the ground flaxseed (or chia seeds) and the rolled oats into the blender. Add ice cubes if using.

Blend to smooth

Secure the blender lid and blend on high for 45–90 seconds, or until smooth and creamy. Stop and scrape down the sides with a spatula if necessary, then blend again briefly to fully combine. The smoothie should be pourable but thick.

Adjust & Serve

Taste the smoothie and adjust sweetness or thickness: add an extra 1/2 tablespoon honey for more sweetness, or 2–4 tablespoons almond milk to thin. Blend briefly after adjustments.

Pour the smoothie into a tall glass. Garnish with a fresh mint leaf and an extra berry or banana slice if desired. Serve immediately.