The New York Times published the following two Neiman Marcus cookie recipes here https://www.nytimes.com/1997/07/02/garden/the-250-cookie-recipe-exposed.html.

The first recipe is a very nice cookie, the second is the recipe for 55 cookies that has been rumored to have originally been sold for $250 to a customer who inquired about the recipe. The Grey Old Lady debunked that rumor.

The Chocolate Chip Espresso Cookie Ingredients:

1/2 c. unsalted butter, softened

1 c. brown sugar

3 T. granulated sugar

1 egg

2 t. vanilla extract

1/2 t. baking soda

1/2 t. baking powder

1/2 t. salt

1 3/4 c. flour

1 1/2 t. instant espresso powder, slightly crushed

8 oz. semisweet chocolate chips.

Heat oven to 375 degrees. Cream butter with sugars until fluffy. Beat in egg and vanilla. Combine dry ingredients, and beat into butter mixture. Stir in chocolate chips. Drop by large spoonfuls onto a greased cookie sheet. Bake 8 to 10 minutes; 10 to 12 for crispier cookie.
12 to 15 large cookies.

The Neiman Marcus $250 Cookie Recipe Ingredients:

1 c. butter

1 c. brown sugar

1 c. granulated sugar

2 eggs

1 t. vanilla

2 1/2 c. oatmeal

2 c. flour

1/2 t. salt

1 t. baking soda

1 t. baking powder

12 oz. chocolate chips

1 4-oz. Hershey bar

1 1/2 c. chopped nuts.

Heat oven to 375 degrees. Cream together butter and both sugars. Stir in eggs and vanilla. Grind oatmeal fine in a blender, then add flour, salt, baking powder and soda. Grate Hershey bar in a blender or processor and add, with chocolate chips and nuts. Drop by spoonfuls, 2 ” apart, on a greased cookie sheet. Bake for 10 min.

About 55 cookies.