Preheat your oven to 375°F (190°C). Grease a baking dish.
In a large mixing bowl, combine cornmeal, flour, baking powder, baking soda, and salt.
In another bowl, mix buttermilk, beaten eggs, and vegetable oil.
Pour the wet ingredients into the dry ingredients and stir until just combined.
Fold in crawfish tails, cheddar cheese, corn kernels, diced onion, bell pepper, and Cajun seasoning.
Pour the batter into the prepared baking dish and spread it out evenly.
Bake for 45 minutes or until the top is golden brown and a toothpick inserted into the center comes out clean.
Let it cool slightly before serving. Enjoy!