Preheat your oven to 375°F (190°C) with a cast-iron skillet inside.
In a medium bowl, whisk 1 cup self-rising cornmeal mix with ½ tsp baking powder.
In a large bowl, beat 2 eggs, then mix in ¼ cup vegetable oil.
Slowly add 1 cup buttermilk (or regular milk) to the egg-oil mixture.
Gradually blend the dry cornmeal mixture into the wet ingredients, avoiding overmixing.
Remove the hot skillet, add 2 tbsp vegetable oil, and coat the bottom.
Pour the batter into the skillet and smooth the top with a spatula.
Bake for 20-25 minutes until golden and a toothpick in the center comes out clean.
Cool for 10-15 minutes before slicing and serving warm.