Place the peeled and pitted peaches into the blender, adding the chili powder, lime juice, sea salt, and ice cubes.
Blend on high speed until the mixture is smooth but still slightly chunky, with small bits of peach visible and a vibrant, frosty texture.
Stop the blender and check the consistency; add more ice if you desire a colder, thicker slushie and blend again briefly.
Taste the slushie and add more chili powder or lime juice if you prefer a stronger spicy or tangy flavor.
Pour the blended peach mixture into glasses, ensuring each is filled with a colorful, frosty drink.
Serve immediately garnished with a small slice of peach or a lime wedge for an inviting presentation.