Begin by popping 7 cups of popcorn using your preferred method, then place it in a large mixing bowl.

In a large saucepan, melt 3 tablespoons of butter over low heat. Add 50 marshmallows and stir until melted and smooth, about 5-7 minutes.

Remove from heat, mix in 1 teaspoon of vanilla extract and 1 scoop of cake batter protein powder (if using). Stir well.

Pour the melted mixture over the popcorn, folding gently to coat without crushing the popcorn.

Fold in a handful of Funfetti sprinkles for even distribution throughout the mixture.

Transfer to a parchment-lined baking dish, pressing firmly into an even layer. Allow to set for 30 minutes.

Optionally, melt white chocolate and drizzle over the treats, then add more sprinkles before it sets.