Preheat the oven to 350 degrees F. Lightly grease a 9-x-13-inch baking dish and set aside.

In a large mixing bowl, mix eggs, oil, milk and vanilla together.

In a medium bowl, blend flour, sugar, baking powder and salt.

Add dry ingredients to the wet ingredients and mix well. Pour half the batter into the prepared baking dish.

In a medium bowl, combine brown sugar and cinnamon and mix well.

Sprinkle half of the cinnamon sugar on top of the batter. Top with remaining batter, by carefully pouring the batter over the cinnamon sugar layer. Sprinkle the remaining cinnamon sugar mixture over the top.

Drizzle the melted butter over the top, using more or less as desired.

Bake for 35–40 minutes and serve warm.