Add your protein powder and sweetener to a bowl and mix to avoid clumping. Then slowly add cold water and mix until you get a runny icing-like consistency.
Now crush up 5 rice cakes and add to the bowl with the icing. Then do the same with 36g crushed fruity pebbles. Mix til all combined.
Add mixture to an 8x8 pan or any pan size. Smaller means thicker bars.
Add to freezer til they are completely frozen. This will be a few hours. This is super important because if not fully frozen, they will be chewy. But when frozen, they will be like a bark. Keep that in mind!
Once frozen, slice up into bars and enjoy! You can easily use these as a quick sweet meal prep snack for the week. Just keep it in the freezer in between!