Chill your coffee: Brew coffee in advance and refrigerate until cold, or use ready-made cold brew. Ice-cold coffee keeps the smoothie thick, not watery.
Prep your base: Add coffee, milk, and frozen banana to the blender first.
These form the foundation of a creamy blend.
Add flavor and protein: Toss in sweetener, vanilla, and any add-ins like cocoa powder, nut butter, or protein powder.
Blend until smooth: Start on low, then increase to high for 20–30 seconds. If it’s too thick, splash in a bit more milk. If it’s thin, add ice or a few more frozen banana slices.
Taste and adjust: Add a little more sweetener, a pinch of salt for balance, or a dash of cinnamon if needed.
Serve immediately: Pour into a chilled glass.
Top with a sprinkle of cocoa, a few cacao nibs, or a swirl of peanut butter for a café-style finish.