3 sour keuchen Recipes

all purpose flour, baking powder, ground cinnamon, salt, unsalted butter, room temperature, sugar, eggs, vanilla extract, almond extract, sour cream, plums, halved, pitted, each cut into 8 wedges

granulated or brown sugar , or 1/4 cup each, all-purpose flour, ground cinnamon, salt, ground nutmeg or cloves (optional), unsalted butter or margarine, softened, coarsely chopped walnuts or pecans, grated coconut, golden raisins, or chocolate chips, or 1 cup any combination (optional), all-purpose flour, double-acting baking powder, baking soda, salt, unsalted butter or margarine, softened, granulated or brown sugar or 1/2 cup each, egg yolks , or 3 large eggs, sour cream or plain yogurt, vanilla extract, grated lemon zest (optional), sugar, vanilla or almond extract, milk or water