How to Make It
Preheat the oven to 400°. Butter a 13-by-9-by-2-inch baking dish. In a food processor, finely chop the onion and garlic; transfer to a bowl. Finely chop the red and green peppers in the processor.
Heat the 1/4 cup of oil in a large heavy skillet. Add the onion, garlic and chile powder and cook over high heat, stirring, until softened, about 5 minutes. Add the chopped peppers and cook, stirring, until slightly softened, about 5 minutes. Stir in the tomatoes with their juices and 2 teaspoons of salt and cook for 10 minutes. Add the turkey, beans and cilantro and spread in the prepared baking dish.
In a bowl, sift together the flour, cornmeal, sugar, baking powder and 1 teaspoon of salt. In another bowl, whisk the milk, eggs and the remaining 3 tablespoons of oil. Stir the egg mixture into the dry ingredients and spoon over the filling; the topping will spread as it bakes. Set the dish on a baking sheet and bake for about 35 minutes, or until the crust is golden. Let stand for 10 minutes before serving.