Place the milk, oats, honey, and beet in the bottom of the blender. Add the optional seeds if using. Then place the rhubarb and banana on top.
Use a high power blender so the beets and rhubarb fully blend into a smooth texture.
Secure the lid. Start the blender on low speed and increase to high speed. Blend until everything is completely smooth, stopping to scrape down the sides as needed.
Pour into 2 medium glasses and enjoy!
Notes
Scroll up to see my step-by-step photos in the blog post. Beets: If you don't have a beet, you can skip it, or use ¼ cup pomegranate or grape juice, making it a bright color. Rhubarb: You can use fresh or frozen rhubarb for this smoothie! If using frozen rhubarb, just increase the milk by ¼-1/2 cup of milk.For this smoothie I recommend using a high power blender. Rhubarb and beets have a thick texture and you will want them to be fully blended to make a creamy smoothie.