Makes 24 muffins or 1 - 10" cast iron skillet

Nonstick cooking spray, for spraying muffin tin
2 cup white cornmeal
1 cup yellow cornmeal
2 tablespoons baking powder
2 tablespoons sugar
1 finely diced jalapeno seeded
2 1/2 teaspoons kosher salt
1 cup milk
1 cup buttermilk
1/2 cup canola oil
1 1/2 cups frozen corn kernels
1 cup grated sharp Cheddar
1 cup finely diced yellow onion (about 1 small)
1/2 cup diced green bell pepper

Preheat the oven to 375 degrees F. Spray two 12-cup muffin tin with nonstick spray and place in the oven while you make the batter.
In a large bowl, combine the cornmeal, baking powder, sugar, and salt. Stir to combine. Add the milk, oil and corn and stir until just combined. Stir in the Cheddar, onions and green peppers and Jalapeno and stir just until incorporated.
Carefully remove the hot muffin tin from the oven and ladle the batter into it. Return to the oven and bake until a toothpick comes out clean, about 15 minutes. Let cool 5 minutes. Remove from the muffin tin and serve.