Place all ingredients together in a blender and blend until smooth. Taste and make any needed adjustments (read notes) until desired taste and consistency.
Notes:
-You can use frozen banana chunks and less ice cubes.
-You can add fresh spinach (yes, really) for more nutrition. Start with adding ½ cup, then up to 2 cups, to taste.
-You can easily play with the amount of ingredients. Use more cocoa or peanut butter for a stronger flavor, use more milk for a thinner smoothie, or replace yogurt with milk and vice versa according to your tastes.