Melt the butter over medium heat and stir in the sugar and protein powder.
Bring to a boil and keep whisking for about 4 minutes making sure it doesn’t burn. Then add the baking soda, whisk it one last time and take off the heat.
Place the popcorn into a large bowl and working quickly pour the caramel over it and fold it gently with a spatula making sure to cover all kernels.
Spread on a baking tray lined with parchment paper to cool. Enjoy when cooled. If kept longer it will go chewy.
Recipe by @maryles_plantry