This was another activity via Pinterest via Indulgy. It was a huge hit. Like an almost two hour hit (which is totally amazing for a 2 year old)! All I did was put baking soda in the bottom of the pan and made a few different containers of food coloring. I forgot to mix the food coloring with vinegar (so that it fizzes), but that will be something "extra" for next time we do this.
We prolonged the activity by decorating with sprinkles that we had. He loved it. He even made pancakes out of the sprinkle mess. =)