Preheat the oven to 175 C (350 F). In a larger sized bowl, mix the flour, granulated sugar, salt, brown sugar and nutmeg until there are no lumps left. Mix in the vegetable oil. Keep one half of vegetable oil for topping and set aside.
Into the mixture, stir in the baking soda, buttermilk, eggs and cinnamon to the topping. Spread the batter in a greased pan and sprinkle with the topping, Bake or 45 minutes until a toothpick comes out clean