Many people enjoy cookies that are thick and chewy, and the process of making this type of cookie is quite easy. Soft cookies are different from crunchy ones because they have more moisture. By altering the ingredients, applying certain baking techniques, and storing them properly, you can create soft, chewy cookies.
Steps
Add or substitute ingredients in the recipe

Add molasses or honey to the cookies. Adding one tablespoon of molasses (about 20g) to the cookie dough will increase the moisture and create a soft, chewy texture. If you don't like the flavor of molasses, try adding one tablespoon of honey. However, don't add too much of these liquid sweeteners, as they can make the cookies soggy or too sweet. One tablespoon is enough to make the cookies softer without affecting the dough's structure.

Replace brown sugar with white sugar. Brown sugar contains more moisture than white sugar, so the cookies will be chewier. Replace the white sugar in the recipe with brown sugar in a 1:1 ratio. This also adds a rich caramel flavor to the cookies.

Use lard instead of butter. Butter contains fat, milk solids, and water, while lard is 100% fat. Using butter in cookies creates steam during baking (due to the water content), which can make the cookies dry. Lard helps create a chewier, softer texture. If you want to substitute butter with lard, use a 1:1 ratio.
Replace egg yolks with egg whites. This means using two egg whites for every egg in the recipe. Egg yolks contain more fat than egg whites, so cookies made with egg yolks will have more oil and be moister.

Choose a recipe that calls for baking powder instead of baking soda. Baking powder has a higher acid content than baking soda, which reduces the rise of the cookies. This prevents the dough from losing too much moisture as it sets.
Use baking techniques that increase chewiness.

Lower the oven temperature. Many cookie recipes call for an oven temperature of 176°C or higher. However, baking at such a high temperature can cause the cookies to lose moisture and softness. To preserve their moisture, follow the recipe's instructions and bake the cookies at 162°C.
Bake the cookies for a shorter time. If you enjoy a specific cookie recipe but find the result too crisp, try reducing the baking time. When you remove the cookies from the oven, the edges should be golden brown while the center remains soft. This method will yield chewier cookies.

Chill the dough before baking. Letting the dough rest in the fridge for at least an hour helps reduce moisture and increases the sugar concentration, resulting in softer and chewier cookies.
- The longer the dough chills, the chewier the cookies will be. Professional bakers often rest their dough for several days to achieve the perfect texture. However, do not refrigerate the dough for more than a week.
How to store cookies to keep them chewy

Allow the cookies to cool completely, but don't leave them exposed to air. After baking, let the cookies cool completely on the baking tray. Then, store them immediately after they reach room temperature. If left exposed to air, cookies will become dry.
Store cookies in an airtight container. To keep your cookies soft and chewy, store them in an airtight container, such as a cookie jar with a lid or a Tupperware box. If you don't have either, you can use a ziplock plastic bag.
- Make sure the cookies are completely cool before storing them. Placing hot cookies in a sealed container will cause them to become soggy.

Add a slice of fresh bread to the container. To prolong the softness and chewiness of your cookies, simply add a slice of fresh bread when storing them. The bread will help retain moisture in the container, and the cookies will absorb it. The next day, you'll notice that the bread has dried out, but the cookies remain soft and chewy.
