In a bowl, combine the Fairlife milk and almond milk.
Add the Frosted Flakes cereal and mix well.
Refrigerate for 6 to 7 hours to create cereal milk.
Strain out the cereal and reserve the cereal milk.
Pour the cereal milk into a Ninja Creami pint container.
Add the extra 100g Fairlife milk.
Mix in the protein powder, marshmallow fluff, protein cookie butter powder, pudding mix, sweetener, and sea salt.
Blend using a milk frother until smooth.
Freeze the mixture until solid, preferably overnight.
Place the frozen pint into the Ninja Creami and run the Lite Ice Cream function once.
Scoop and enjoy.