Heat oven to 400°F. Spray bottom and sides of 8-inch square (2-quart) glass baking dish with cooking spray (without flour). In medium bowl, mix cornmeal, all flours, the baking powder, baking soda, 1 teaspoon salt, the xanthan gum and guar gum. In large bowl, beat milk, vinegar, sugar and eggs with electric mixer on medium speed until frothy. Gradually add ghee, beating constantly until thoroughly mixed. Add cornmeal mixture; beat on low speed about 1 minute or until well blended. Pour into baking dish.