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Or it could be that 1 tsp is a perfectly fine amount of baking powder, but since 1/2 tsp works just as well, the recipe allows you to save your baking powder for another batch. Also, did you taste your cupcakes? Maybe 1 tsp of baking powder is good for the height of the cupcakes but not for the taste. Maybe 1 tsp is still an acceptable amount to allow the cupcakes to rise, and 2 tsp could be too much.Īs Kerri mentioned, self-rising flour may have an effect here. It looks like 1/4 tsp is not enough (since those cupcakes look like the ones with no baking powder), and that 1/2 tsp and 1 tsp both work well. It may well be true that too much baking powder can cause the cupcakes to fall, but it could be that there is a range of amounts that allows the cupcakes to rise to a good height. When it comes to interpreting your results, I think you have very clear and interesting results. Kerri has given you some excellent feedback! There are many variables to consider when baking.