1 (14 ounce) can pineapple chunks, drained with juice reserved
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½ (8 ounce) package fresh baby spinach, or to taste
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salt and freshly ground black pepper to taste
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1 pound uncooked shrimp - peeled, deveined, and chopped
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4 (8 inch) flour tortillas
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1 cup freshly shredded sharp Cheddar cheese, or more to taste
Instructions
Preheat the oven to 350 degrees F (175 degrees C). Spray a 9x13-inch baking dish with nonstick spray.
Heat oil over medium to medium-high heat in a large, nonstick skillet until hot. Add onion and cook until it begins to caramelize and become tender, 3 to 5 minutes; reduce the temperature if it's cooking too quickly. Add chipotle pepper in adobo, garlic, chili powder, cumin, paprika, and oregano. Reduce heat if needed and stir for 1 more minute until seasonings are fragrant.
Add tomato sauce, pineapple chunks, 1 tablespoon pineapple juice, and spinach. Simmer over low heat, stirring frequently, until spinach is wilted. Taste and season with salt and pepper. Adjust other seasonings to your preference.
Spread 1/2 to 1 cup of the sauce in a thin layer all over the bottom of the prepared baking dish.
Add raw shrimp to the remaining sauce. Simmer until shrimp are bright pink on the outside and the meat is opaque, about 3 minutes.
Lay a tortilla on a baking sheet and fill with the pineapple-shrimp filling. Roll up carefully and set into the baking dish, seam-side down. Finish filling remaining tortillas and arranging in the baking dish, reserving about 3/4 cup of filling. Spread the remaining filling over the enchiladas and sprinkle evenly with Cheddar cheese.
Bake in the preheated oven until sauce is bubbly and cheese is melted, about 30 minutes. Remove from oven and allow to sit for 15 to 20 minutes before serving.