Copyright: Mark Bittman, How to Cook Everything Vegetarian 2 cups all-purpose or cake flour, plus more as needed (cake flour makes softer crumb) 1 scant teaspoon salt 1 tablespoon baking powder 1 teaspoon baking soda 2 to 5 tablespoons cold butter (more is better) 7/8 cup yogurt or buttermilk (I used buttermilk) 1. Preheat the oven to 450. 2. Mix the dry ingredients together in a bowl or food processor. Cut the butter into bits and either pulse it in the food processor (easier) or pick up a…