To substitute self-rising flour for all-purpose flour, you'll need to make some adjustments to your recipe. For every 1 cup of all-purpose flour called for, use 1 cup of self-rising flour and omit 1 1/2 teaspoons of baking powder and 1/4 teaspoon of salt. Easy peasy, right?
But here's the thing: self-rising flour is not always a 1:1 substitute. It's best used in recipes that don't require a lot of leavening, like quick breads, muffins, and cookies. So, if you're making a cake or yeast bread, it's best to stick with all-purpose flour.
Now, you might be wondering why self-rising flour is even a thing. Well, it's actually a pretty old-school ingredient that was popular back in the day. It was invented by a clever flour miller who wanted to make baking easier for his customers. And, let's be real, who doesn't love a good shortcut in the kitchen?