The first Girl Scout cookie was invented in Wilmette, IL (according to my secret sources). Here is the original recipe. It’s kind of crumbly…
1 cup butter
1 cup sugar plus additional amount for topping (optional)
2 eggs
2 tablespoons milk
1 teaspoon vanilla
2 cups flour
1 teaspoon salt
2 teaspoons baking powder
Cream butter and the cup of sugar; add well-beaten eggs, then milk, vanilla, flour, salt, and baking powder. Refrigerate for at least 1 hour. Roll dough, cut into trefoil shapes, and sprinkle sugar on top, if desired. Bake in a quick oven (375°) for approximately 8 to 10 minutes or until the edges begin to brown. Makes six- to seven-dozen cookies.