01 - Add the frozen blueberries, mango chunks, rolled oats, and almond milk to a blender jar.
02 - Add honey or maple syrup, vanilla extract, and chia or flaxseeds if using.
03 - Blend on high speed until completely smooth, approximately 1 minute.
04 - Taste the smoothie and adjust sweetness as desired by adding more honey or maple syrup.
05 - Pour into two glasses and serve right away for the best texture and flavor.