Ingredients

• 2 very ripe bananas, cut into chunks and frozen
  
• 2 (2-ounce) shots of espresso (or 4 ounces strong coffee), cooled
  
• ¹/₂ cup Greek yogurt
  
• 6 ounces milk, plus more as needed
  
• 1 tablespoon (heaped) cocoa powder
  
• 1 tablespoon honey (optional)