Baking soda and powder will produce very different results, and which is better depends on what kind of cookie you're making ...

If you have cream of tartar and baking soda you can make your own baking powder. Just use a 2:1 ratio of cream of tartar to baking soda, then measure as you would for baking powder. Related ...

You can make your own baking powder by combining 15ml/1tbsp bicarbonate of soda with 30ml/2tbsp cream of tartar. Measure carefully as too much or too little can upset a recipe’s balance.

Like baking soda, you should use the exact amount of baking powder called for in the recipe. If you use too much baking powder, it could make your baked goods taste bitter with a coarse and crumbly ...

Preheat the oven to 180°C, or 350°F. The ideal texture and even baking are achieved by preheating the cookies. Creamy butter ...