Pour the milk into your blender, then add the banana and yogurt. Blend for 20 seconds until smooth.
Throw in oats, chia, flaxseed, and greens if using. Blend another 20–30 seconds. The texture should start to resemble a thick smoothie—not a smoothie-sandwich.
Add berries, cinnamon, and a few ice cubes. Blend until creamy and cold. If it’s too thick, splash in a bit more milk.
Taste and adjust. If you want more sweetness, add a drizzle of honey or a splash of vanilla—but keep fiber in mind, sugar should be a background track, not the lead.
Pour into a tall glass or two smaller ones. Sip slowly and celebrate a small win: fiber without the fuss!