1. Combine the milk, dates, banana, avocado, chia seeds, spinach, protein powder, ¼ teaspoon peppermint extract, and ice cubes in a blender. Blend on high until smooth, adding more milk as needed to facilitate blending.

2. Taste and add remaining ¼ teaspoon of peppermint extract and additional sweetener if desired.

3. Top with cacao nibs or mini chocolate chips and fresh mint and serve immediately.