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Preheat oven to 375° F.
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Heat oil in a 10-inch cast iron (or ovenproof) skillet over medium-high heat.
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Add onion, bell pepper, and turkey; cook, stirring frequently, for 6 to 8 minutes, or until turkey is cooked through.
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Add tomatoes, tomato paste, chili powder, cumin, and ¼ tsp. salt. Bring to a boil, stirring frequently. Reduce heat to medium; cook, stirring frequently, for 10 to 15 minutes, or until sauce has thickened. Remove from heat. Coat sides of pan with spray.
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While turkey mixture is cooking, boil water in medium saucepan over high heat.
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Add cornmeal; cook, stirring constantly, for 2 to 3 minutes, or until cornmeal has thickened. Remove from heat.
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Add remaining ½ tsp. salt, cheese, jalapenos (if desired), and corn; mix well. Spread evenly over turkey mixture.
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Bake for 40 to 45 minutes, or until top is golden brown and turkey mixture is bubbling. Let sit for 10 minutes before serving.