Prep your watermelon. Chop your chilled watermelon into rough chunks. Pro tip: if your watermelon isn't cold, the ice will dilute everything.
Nobody wants a sad, watery smoothie.
Add everything to the blender. Toss in the watermelon, Greek yogurt, lime juice, your optional sweetener, and ice cubes.
Blend until smooth. Start on a low setting and then ramp it up to high for about 60 seconds. You’re looking for a completely homogenous, slushy texture.
Taste and adjust. Is it tangy enough? Add more lime.
Not sweet enough? A drizzle of honey. You are the master of your smoothie destiny.
Serve immediately. Pour it into a glass, slap a mint leaf on top for the 'gram, and consume.
Hesitation is not recommended.