Blend Smoothie Base: In a high-speed blender, combine frozen bananas, peanut butter, cocoa powder, Greek yogurt, and almond milk. Blend until smooth and thick.
Pour into Bowls: Divide the smoothie mixture evenly into two serving bowls.
Add Toppings: Arrange granola, fresh berries or banana slices, and optional toppings over the smoothie base.
Serve: Enjoy immediately for a refreshing, chocolatey, and protein-packed treat.