To a blender, add ice cubes, frozen mango chunks, banana slices, Greek yogurt, orange juice, and honey if you're using it.
Cover the blender and start at medium speed for about 30 seconds, using the tamper if needed to keep everything moving smoothly.
Increase to high speed for another 15 to 30 seconds until the smoothie is thick and smooth. Add more orange juice if needed to get the right consistency.
Taste the smoothie and add more honey if you prefer it sweeter.
Notes
Use ripe bananas for natural sweetness, freeze mango for thicker smoothies, adjust sweetness as desired, and ensure the use of a high-speed blender for best results.