Preheat oven to 375 degrees. Prepare an 8-inch cast-iron skillet with cooking spray and set it aside.
Combine vegan butter, almond milk, and ground flaxseed in a bowl and set aside.
Heat oil in a large skillet over medium-high heat, add onion, and cook until soft, about 2 minutes. Stir in green onion, bell pepper, corn, and 1/2 teaspoon Creole seasoning, and cook until fragrant, about 1 minute. Remove from heat, set aside.
Mix cornmeal, oat flour, almond flour, baking powder, and the remaining 1 teaspoon Creole seasoning in a large bowl and set aside.
Combine vegan butter, almond milk, and ground flaxseed in another bowl. Stir into the almond flour mix. Fold in the sautéed vegetables and cheese.
Heat the cast-iron skillet in the oven for 10 minutes.
Add the batter and bake for 40 minutes