Taste at least, but baking is basically chemistry, if you don't add in the essential ingredients, or add them in at the wrong time, or using the wrong method, it will have a variety of effects on the composition of the cookie itself. For example, no flour would mean it would just be butter, eggs, and sugar. That would be a disgusting burnt mess in the oven.
the ingredient that will most affect the cookie is SUGAR
It normally would only change the texture.
It depends on the missing ingredient. Missing sugar will leave the cookie bland. Missing egg will result in a very crumbly cookie. Missing chocolate chips will result in a sugar cookie. See?
Butter enhances the taste and texture of cookies by adding richness, moisture, and a creamy flavor. It helps create a tender and soft texture while also providing a delicious buttery flavor that complements the other ingredients in the cookie dough.
One delicious dessert recipe that features a cookie crumb pie crust as a key ingredient is a classic cheesecake. The crust is made by combining cookie crumbs with melted butter and pressing it into the bottom of a springform pan before adding the cheesecake filling on top. The result is a rich and creamy dessert with a crunchy and flavorful crust.
One delicious dessert recipe that features a cookie dough pie crust as a key ingredient is a Chocolate Chip Cookie Dough Pie.
Some delicious cookie recipes that use steel cut oats as an ingredient include oatmeal raisin cookies, chocolate chip oatmeal cookies, and cranberry oatmeal cookies. Steel cut oats add a hearty texture and nutty flavor to these cookies, making them a tasty and nutritious treat.
you double the ingredients
It's very easy. Cookie recipes are everywhere, but to get the tastiest ones, why not ask a friend or a colleague - most people have their own special recipe whether it's adding that extra ingredient or just preparing it in a different way!
A common nondairy ingredient to use in cookie recipes in place of butter is shortening. It will change the texture of the cookie, usually cookies with shortening will be a little chewier than cookies with butter.
I believe that it depends upon the ingerdient. Something as small as brown sugar won't make much of a difference in size but the taste of the cookie will change. Your best bet is to use a substitute ingredient or go to your neighbors and ask for whatever it is that you are missing.
You can change the texture of your cookies by modifying the ingredients. Adding a liquid like milk or melted butter may not make the cookies more creamy, take a look at other cookie recipes to see what they do differently to your original recipe.