2/3 cup (158mL)
1 1/3 serving (40g)
Recipe has been scaled from original by 1.33x. Adjust cook times and pan sizes accordingly.
Just find a cereal you like where a serving is in the 100-150 calorie range. Realistically, you could pick any breakfast cereal and just scale the serving size to be in that range since pretty much all breakfast cereals are going to have a very similar macronutrient breakdown.
2 stick (56g)
2 medium (2-2/3" dia) (300g)