Milk Street takes "project baking" to new and exciting heights. First, Christopher Kimball makes Kolaches, Czech-American breakfast treats filled with cream cheese and jam. Rose Hattabaugh 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 and Rosemary Gill offers a lesson on Yeast 101.