The term “quick bread” indicates to cooks that the recipe uses baking soda or baking powder as a leavening agent, not yeast. Yeast is a colony of fungi that produces CO2 after interacting with water and sugar, which can take hours. This quick bread recipe uses baking soda activated instantaneously by a liquid acid. There you have it. No yeast in the bread recipe makes it “quick.” Mix and bake!