You can substitute baking powder in place of baking soda, though you will need a bit more baking powder, because it contains additional ingredients. You can’t directly substitute baking soda if you are out of baking powder. However, you can make your own baking powder, using two parts cream of tartar and one part baking soda. If you use homemade baking powder, be sure to bake your recipe right away after mixing the ingredients. There are commercial baking powders that will allow you to let a recipe sit for a while before baking, but it’s generally a good plan to start heating the food immediately, since the reaction that causes baked goods to rise starts as soon as the wet ingredients are added
