Can you replace cornstarch with baking powder?

No, you cannot replace cornstarch with baking powder. They serve completely different functions in baking:

* Cornstarch is a thickener. It absorbs moisture and creates a smooth, glossy texture. It's commonly used in sauces, gravies, and desserts to prevent them from being runny.

* Baking powder is a leavening agent. It reacts with moisture and heat to produce carbon dioxide gas, which causes baked goods to rise. It's essential for light and airy textures in cakes, muffins, and biscuits.

Using baking powder instead of cornstarch will not achieve the same results. Your recipe will likely be too airy and light, or even collapse completely.

If you need a thickener, you can use alternative options like:

* Flour

* Arrowroot powder

* Tapioca starch

If you need a leavening agent, you can use:

* Baking soda (but it requires an acidic ingredient like buttermilk)

* Yeast (for bread)

It's important to understand the role of each ingredient in baking for successful results.