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1
Adjust oven rack to center position and preheat oven to 425u00b0F. Heat oil in a large Dutch oven, or saucepan over high heat until lightly smoking. Add corn and cook, stirring occasionally, until corn is well charred in spots, about 4 minutes. Add onion, bell pepper, and poblano pepper, season with salt and pepper, and cook, stirring, until softened but not browned, about 3 minutes.
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2
Add garlic, Serrano pepper, cumin, coriander, oregano, and chili powder and cook, stirring, until fragrant, about 30 seconds. Add olives, soy sauce, tomatoes, black beans, and kidney beans. Bring to a simmer and adjust heat to maintain. Cook, stirring occasionally, until thick and fragrant, about 20 minutes. Stir in grated cheese, scallions, and cilantro and season to taste with salt and pepper. Set aside.
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3
Heat butter in a 12-inch cast iron or stainless steel skillet over medium heat until melted. Continue to cook, swirling pan gently until butter is nutty-smelling and solids are a toasty brown. Transfer to a heatproof cup or bowl and let rest until slightly cooler, about five minutes.
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4
Combine cornmeal, flour, sugar, 1 teaspoon kosher salt, baking powder, and baking soda in a large bowl. Combine eggs, sour cream, and buttermilk in a second bowl and whisk until homogenous. Whisking constantly, slowly drizzle in reserved browned butter. Whisk wet ingredients into dry ingredients until homogenous. Fold in scallions and jalapeno pepper.
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5
Transfer bean mixture to a large cast iron skillet. Using a large spoon, place small dollops of the cornbread batter mixture on top of the bean filling, then use the back of the spoon to spread it into an even layer. Transfer the skillet to the oven and bake until pale golden brown and a skewer inserted into the cornbread comes out clean, about 20 minutes.
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6
Let cool 15 minutes, then serve with sour cream.
