In a given day? 0
Any given week? 0
In a given month? 0
But, on the occasion that there are cookies and I do eat cookies, I will eat no less than half the pack. And if they're Oreos, after about 20 my tongue gets greasy and I lose the taste for them.
I don't buy them anymore, same with candy and most other snacks. I know what happens once that stuff enters the house: I eat it all in a few days. The easiest place to stop this is in the supermarket when I consider buying the stuff.
Not necessarily even the size. But the kind of cookie. Oreos? Three or four, with milk. Chocolate chip? That's my weakness. I make two types; the more traditional where I have to make myself stop at three, but could finish a dozen. And there's the kind that levain bakery made famous. One cookie is almost an inch thick, three to four inches around, and packed full of chips. I can barely finish one, but would otherwise gorge myself.
I have to be careful making chocolate chip cookies. Store bought? Two or three, depending on size. Usually with milk.
Something more like murder cookies, one or two. They're so good it's absurd, but they're very satisfying without flipping whatever switch it is that makes chocolate chips nigh addictive.
But nilla wafers? Fuck me. A dozen, easy, because as good as they are, they're kinda "empty".
Peanut butter cookies take 3 ingredients and literally 15 minutes from the moment you decide to make them to the moment you stick the still-too-hot cookie in your mouth.
If cookies are in fact the same as what we call biscuits, you can basically make a crumble mixture (2 parts flour, one part butter, one part sugar, plus any adjuncts you want) then bind it in your hands like you would a snowball, then roll it into a thick sausage, cut quarter-inch-thick discs out of the sausage, and bake them at 160°C for between 15 and 30 minutes depending how good your oven is. They harden as they cool. Easy peasy.
Depends on the cookie and what I'm trying to achieve.
Chocolate chip? Zero unless it's uncooked dough, and I will be quietly annoyed that chocolate chip cookies were chosen.
Lofthouse sugar cookies from the supermarket? With the frosting and lethal amounts of sugar? A lot.
Lofthouse's birthday cake flavored sugar cookie with that weird French vanilla flavor and even more sugar that's like an orgasm in cookie form? As much as I can afford to buy. I've been trying to eat no more than three at a time simply because I don't want to blow all my money, but it's so good.