Can I use ENO instead of baking powder ?
Baking powder can be substituted with 1/2 tsp ENO. Eno is a fruit salt which is composed of basically 60% baking soda and 40% citric acid. So if you have these on hand, then you can use this proportion to substitute for ENO. If citric acid is not available, you can use some other souring agent instead along with Baking soda.