Prep your base: Add frozen banana slices, peanut butter, protein powder, Greek yogurt, flax or chia (if using), vanilla, and a small pinch of salt to a high-speed blender.
Add liquid gradually: Pour in 1/2 cup of milk to start. You want a thick blend, so it’s better to add more later than to make it runny now.
Blend low and slow: Start on low speed and use a tamper if your blender has one.
Blend until smooth and thick, stopping to scrape the sides as needed. If it’s too thick to move, add a splash more milk.
Taste and adjust: If you prefer it sweeter, add a drizzle of honey or maple syrup. For more peanut punch, add another teaspoon of peanut butter.
Blend again briefly.
Serve immediately: Spoon the mixture into bowls. The texture should hold its shape like soft-serve.
Add toppings: Go for a mix of crunch (granola, nuts), freshness (berries, banana slices), and richness (cacao nibs, dark chocolate). A light drizzle of honey can brighten the flavors.