Milk Street takes "project baking" to new and exciting heights with two recipes for show-stopping sweets. First, Christopher Kimball makes Kolaches, Czech-American breakfast treats filled with lemon-scented cream cheese and jam. Rose Hattabaugh then bakes Chocolate and Tahini Babka, a creative twist on the braided bread. Plus, Wes Martin shares the secret to proofing your dough in a cold kitchen.