Preheat oven to broil with rack 5 inches from heat source. Heat 2 tablespoons oil in a 10-inch broiler-safe skillet over medium heat. Add sliced poblano, chopped onion and 1 cup corn; cook, stirring occasionally, until softened, about 10 minutes. Add minced garlic; cook, stirring constantly, until fragrant, about 1 minute. Remove from heat.
Stir in 1½ teaspoons smoked paprika, ½ teaspoon coriander, ¼ teaspoon each cumin and salt, the rinsed beans and 1 (15-ounce) can enchilada sauce. Fold in tortilla strips until evenly combined; sprinkle with 1 cup Cheddar. Broil until the cheese is melted, about 3 minutes.
Top with 2 tablespoons each radishes and cilantro and 1 tablespoon pickled jalapeños, if desired. Serve dolloped with ⅓ cup sour cream.
