We're hosting a meeting in the morning and want to serve the "Sour Cream Coffee Cake with Brown Sugar-Pecan Streusel" from Cook's Illustrated (if you haven't tried it; it's fabulous.) However it involves a number of steps and we don't want to get up TOO terribly early so we're looking for ways to shorten the prep process. Could we make the streusels (one is used as filling for a few layers and the other as topping) tonight and just refrigerate them? They involve AP flour, white and dark brown sugars, cinnamon, butter, and chopped pecans. I know this sounds like a stupid question, but I wanted to make sure none of the tastes would go south on me. I don't think there's anything I can do about the coffee cake itself since it involves eggs, butter, and sour cream. But having the streusels out of the way would help. thanks!