In a blender, combine the chilled coconut milk, frozen bananas, vanilla extract, non-dairy yogurt, lime juice, and sea salt.
Blend on high until smooth and creamy. If a thicker consistency is desired, add ice cubes and blend again until incorporated.
Taste and adjust sweetness with maple syrup if necessary.
Pour the milkshake into glasses and serve immediately, garnished with a lime wedge or a sprinkle of coconut flakes if desired.
Notes
Ensure the coconut milk is well chilled for a creamier texture. Adjust the sweetness based on your preference; the natural sweetness from bananas might be sufficient. For a more decadent version, consider adding a spoonful of coconut cream on top.