Why are they called black and white cookies if the base is not black?
Because the top is the star. Classic New York style black and whites are a vanilla, cake-like cookie with half vanilla icing and half chocolate icing. The “black” is the chocolate side.
Are black and white cookies cookies or cake?
They are technically cookies, but the texture is closer to cake. Think: soft crumb, not crunchy edges. If yours come out crisp, they likely baked too long or the dough had too much flour.
How do I keep the cookies soft?
Do not overbake. Pull them when the centers look set and spring back lightly, even if they look pale. Also, measure flour carefully and use the sour cream, it helps a lot.
Why did my icing get dull or streaky?
Icing that is too thick drags and sets rough. Add warm water a teaspoon at a time until it spreads smoothly. Also, ice the cookies while they are fully cooled so steam does not cloud the finish.
How do I keep the vanilla and chocolate from bleeding into each other?
Two easy moves: ice the vanilla side first and let it set for 5 to 10 minutes, then “butt” the chocolate up to it (spread from the outer edge toward the center). If you drag the spatula across the seam, you are basically inviting the gray swirl situation.
Can I make them without cake flour?
Yes. Swap the cake flour for the same amount of all-purpose flour. The cookies will be slightly less tender, still delicious. If you want a closer texture, you can make a quick substitute: for each cup of cake flour, use 1 cup all-purpose flour minus 2 tablespoons, then add 2 tablespoons cornstarch and whisk well.
Why did my cookies spread too much?
Usually it is one of three things: butter that was too warm, batter that got overmixed, or scoops that were not mounded enough. Next time, make sure the butter is softened (not shiny or melty), mix just until combined once flour goes in, and if your kitchen is warm, chill the scooped batter on the sheet for 10 minutes before baking.