Meet your new obsession. Three. Ingredient. Ice Cream Sandwiches. The key ingredient is self-rising flour, a combination of all-purpose flour, baking powder, and salt. If you can’t find it (or don’t feel like making a special trip to the supermarket) you can make it yourself: for every cup of flour add 1½ teaspoons baking powder and ¼ teaspoon salt. From there, choose your favorite ice cream and start experimenting. We like pints with some texture—chocolate chips, nuts, rum-soaked raisins—but not too much. Too many bells and whistles will make the cookies crumble and nobody wants that.