Preheat oven to 350°F.; convection oven to 325°F. Line one, half-sheet baking pan (13 x 18-inch) with parchment paper. Combine flour, corn starch, baking powder, baking soda, salt, cinnamon, ginger and nutmeg in a large bowl until very well blended. (May prepare dry mix ahead.) Whisk, or beat together, the buttermilk, sugar, corn syrup, melted butter, eggs, oil and vanilla extract in a large mixing bowl until smooth. Toss raisins (if using) with the flour mixture before adding the liquids. Bake an additional 5 minutes. * If using raisins, cover with water and drain; let stand. Recipe adapted to meet Smart Snack Standards by the Home Baking Association (www.homebaking.org)
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