1 cup of self rising flour is equal to 1 cup of flour, 1 1/2 teaspoons of baking powder and 1/2 teaspoon of salt for every cup of flour. This recipe calls for 2 1/4 cups cups. You can use 2 cups of flour, 1 tablespoon baking powder and 1 teaspoon of salt. This will give you a total of 2 cups plus a little over a tablespoon of self-rising flour. Throw in about 3 more tablespoons of flour as needed and don't worry about using more baking powder or salt.