Exactly 42 chocolate chips per 3/4 cup of batter.
cooking.stackexchange.com/users/3779/Computerish
The best percentage depends entirely on your own taste, and the texture and sweetness of your cookie dough.
It also depends on the size of the chips.
Standard North American chips?
Chunks you hacked out of a block of couverture?
There are too many variables here to give a good answer.
The only way to find out the 'best' percentage is to experiment and see what you like.
Alternatively, find your favourite brand of chocolate chip cookie, and count how many chips are in, say, 10 cookies.
Average that number
and there you are.
cooking.stackexchange.com/users/None/
My mom and I love to bake chocolate chip cookies together and this is an issue we run into every time-
how many chips are too many?
I like to pour in about half of a standard bag of Nestle morsels and spoon out my cookies, while my mom waits until I'm done, then adds the other half a bag of morsels to the other half of the dough, then adds pecans or walnuts and spoons out her batch.
Its all about personal preference and the likes and dislikes of your audience :)
cooking.stackexchange.com/users/4888/Jginger
12.27 The original Tollhouse Chocolate Chip Cookie recipe calls for two cups of chips or one 12-oz.
bag of standard-size semi-sweet chocolate morsels.
The recipe makes 60 (rounded tablespoon-sized) cookies.
I have a 12 oz.
bag of chocolate chips here that indicates in the "Nutrition Facts" box that one serving is equal to 32 chips.
It says the bag contains 23 servings.
That's 736 chocolate chips per bag.
736 divided by 60 equals an average of 12.27 chocolate chips per cookie.
cooking.stackexchange.com/users/10360/Callithumpian
While it depends on your taste and recipe, I can tell you what's my favorite amount.
I tend to chop chocolate to pretty big pieces
(cubes approximately 2cm long).
I tend to put as many chocolate chips as it takes so that some of them fall off when mixed with the dough.
I then additionally push leftover chips in dough when forming cookies.
I try to avoid chips that are too small and chocolate powder; somehow the cookies are better when chocolate powder is not mixed into dough.
I suppose the contrast between the dough and chocolate chips is what makes them tasty.
cooking.stackexchange.com/users/5767/Domchi
I've been making chocalote chip cookies for a while and I just can't decide how many chocolate chips to put in each cookie. So maybe once and for all I can get a good answer to the question:  What is the best percentage of chocolate-chips for a chocolate cookies? And what are the pros and cons for putting more or less chocolate chips?
Amount of Chocolate-chips in a Chocolate-chip cookie?
cooking.stackexchange.com
<chocolate><cookies>
cooking.stackexchange.com/questions/14052
cooking.stackexchange.com/users/5555/Nachshon Schwartz
The best way is to experiment or find the amount in your favourite cookies. You can base this on the desired consistency or the number per cookie or amount of batter. Around 40 chips per 3/4 cup of batter. You should experiment with what works for you.
42 chocolate chips per 3/4 cup of batter or as many chocolate chips as it takes for them to start falling out of the batter. Experiment with what works for you or count the number of chips in your favourite cookies.