Gluten-Free Zucchini-Almond Cake
Look for almond flour (also called almond meal) in the baking aisle. To keep it fresh, freeze in an airtight container for up to 1 year.
Pure vanilla extract is always gluten-free, but check your baking powder: Brands made with corn or potato starch are okay, but those that use wheat starch are not.
When Martha made this cake on "Martha Bakes," she doubled the batter ingredients and tripled the frosting ingredients to make a two-layer cake.