Add the frozen mango chunks into the blender, followed by the ground cinnamon and lime juice.
Pour in the ice cubes and secure the lid on the blender.
Blend on high speed until the mixture is smooth and creamy, with no large chunks remaining. The ice should be fully incorporated, and the color vibrant orange.
Stop the blender and check the consistency; if it’s too thick, add a splash more lime juice or water and blend briefly to loosen it.
Pour the slushie into glasses, and you can garnish with a sprinkle of cinnamon or a lime wedge if desired.
Serve immediately with a straw, enjoying the icy, tropical-spiced flavor that captures summer in every sip.