1 cup unsweetened coconut milk
1/2 cup packed baby spinach leaves
1/2 cup whole-milk plain yogurt
1/4 cup packed fresh mint leaves
1 to 1 1/2 cups ice
2 to 3 tablespoons erythritol sweetener (see Cook's Note)
1 tablespoon cacao nibs, plus more for serving
Erythritol, a sugar substitute, can be found in most health food stores or online.