Preheat oven to 350°F. Grease a square 8 x 8-inch baking pan, line with parchment paper.

Combine flour, corn starch, baking powder, baking soda, salt, cinnamon, ginger and nutmeg in a medium bowl until very well blended.

In a large mixing bowl, whisk, or beat together, sugar, buttermilk, eggs, oil, melted butter, and vanilla extract until smooth. Toss raisins (if using) with the flour mixture before adding the liquids. Pour into prepared pan and bake for 30-35 minutes.

TIP* If using raisins, cover with warm water, let sit 5 minutes then drain before using. For a fancy presentation, try our spice frosting instead of the drizzle.