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Preheat oven to 400 degrees. Coat a 9x13 baking dish with nonstick spray.
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Sauté chiles, onion, and garlic for the sauce in ¼ cup olive oil in a sauté pan over medium-high heat. Cook until chiles and onion soften, about 5 minutes, then add tomatoes. Simmer 2 minutes, stir in broth, sugar, salt, and optional chili powder. Bring to a boil, reduce heat to medium and simmer 15 minutes. Cool briefly, then puree in a blender.
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Sauté spinach for the enchiladas in 2 tbsp olive oil in a large skillet over medium-high heat until wilted, about 2 minutes. Add chicken, corn, 1 cup cheese, and cream. Simmer 3-5 minutes and season with salt.
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To assemble, pour ½ cup sauce in the prepared baking dish. Fill each tortilla with 1/3 cup filling and roll up. Place enchiladas in the dish, seam side down, then top with 1-2 cups sauce, leaving the edges dry. Sprinkle with remaining 1 cup cheese. Bake 15-20 minutes, or until cheese is melted and tortillas begin to brown on the edges.