Prep your base: Add the frozen banana, cauliflower rice (if using), yogurt, and milk to the blender.
Build the cake flavor: Add vanilla extract, almond extract, sweetener of choice, and a pinch of salt.
These are key to the birthday-cake taste.
Boost the texture: Add cashew or almond butter and rolled oats if you like a thicker, creamier smoothie. Include protein powder if desired.
Blend until smooth: Start on low, then increase to high for 30–60 seconds. Add a few ice cubes if you want it frosty and thicker.
Fold in sprinkles: Pulse the blender 1–2 times or stir them in by hand. Don’t over-blend or the colors may bleed.
Taste and adjust: Add more milk to thin or more ice to thicken.
Adjust sweetness to your preference.
Serve: Pour into a chilled glass and top with extra sprinkles. Enjoy right away.