Baking powder is a mixture of baking soda, starch and an acid (often tartar) to activate the baking soda. Since baking soda is already in the baking powder, it is possible you will not need any additional baking soda. Baking powder and baking soda are used to "raise" or puff up the pastry - too little and it will not raise properly...too much and it will taste like soda.
If you do not have a specific recipe, you will need to experiment.
To make sugar cookies without using baking powder, you can substitute it with baking soda and cream of tartar. Simply mix 1/4 teaspoon of baking soda with 1/2 teaspoon of cream of tartar for every 1 teaspoon of baking powder called for in the recipe. This will help the cookies rise and achieve a similar texture without the use of baking powder.
To replace for example 3 teaspoons of baking powder with baking soda, mix 1 teaspoon of baking soda with 2 teaspoons of cream of tartar.
You can use cream of tartar and baking soda as a replacement for baking powder. One half teaspoon of cream of tartar and one quarter teaspoon of baking soda will equal one teaspoon of baking powder.
You can substitute a mixture of baking soda and an acid like cream of tartar or lemon juice for baking powder in a recipe.
You can substitute baking powder with a mixture of baking soda and an acidic ingredient like cream of tartar, lemon juice, or buttermilk in a recipe.
You can use a mixture of baking soda and an acid like cream of tartar or lemon juice as a substitute for baking powder in your recipe.
I have been informed that baking powder is 1/4 baking soda & 5/8 cream of tartar the rest being made up of various other ingredients. Baking soda by itself is no good as it is alkaline and you need an acid so, depending on the recipe, you could try lemon juice, white vinegar or buttermilk.
baking pouder
There are approximately 2g of carbohydrates in 1 teaspoon of baking powder. These mostly come from the starch (often cornstarch) put into baking powders to stop them from clumping. You can make a low carb version using the following conversion: 1 teaspoon of baking powder = 1/4 teaspoon baking soda + 1/2 teaspoon cream of tartar.
A suitable substitute for baking powder in a recipe is a mixture of baking soda and an acidic ingredient like cream of tartar, lemon juice, or buttermilk.
If you don't have baking powder, you can substitute it in a recipe by using a mixture of baking soda and an acidic ingredient like cream of tartar, lemon juice, or buttermilk.
If you are using it as a levening agent, you can substitute baking powder. One teaspoon of baking powder replaces 1/3 tsp of baking soda AND 2/3 tsp cream of tartar.