Proof your yeast to find out if it's still active by adding 1 teaspoon of sugar and 2 1/4 teaspoons of yeast (one envelope) to 1/4 cup of warm water. Then, wait 10 minutes.

Yeast is a vital ingredient in many bread recipes, but you may wonder whether other ingredients can be used in place of it in a pinch. Here are the 3 best substitutes for yeast.