When removing the popsicles from the mould, warm them slightly under running water.
Notes
Use a thick Greek yogurt for the best texture. The thicker the yogurt, the creamier the popsicles will be.
Blend the mixture really well so the cocoa powder fully dissolves and there are no dry patches or streaks of peanut butter.
Taste the mixture before freezing. Once frozen, the sweetness will taste more muted, so the mixture should taste a little sweeter than you would usually want.
Do not overfill the moulds, as the mixture may expand slightly as it freezes. Leave a small gap at the top.
Tap the moulds gently on the worktop after filling to remove air bubbles and help the mixture settle evenly.
If your popsicle sticks are not standing upright, freeze the moulds for 30-40 minutes first, then insert the sticks once the mixture has started to firm up.
For the smoothest texture, use a high-speed blender. A food processor will work too, but the mixture may not be quite as silky.
The protein content will depend on the brands of Greek yogurt, milk and peanut butter used, as well as the size of your popsicle moulds. To keep them at around 18 grams of protein each, use high-protein Greek yogurt and divide the mixture between 4 large moulds.