Preheat oven to 400 degrees F (200 degrees C). Spray a baking dish with cooking spray.
Place plantains and salt into a large pot and cover with water; bring to a boil. Reduce heat to medium-low and simmer until plantains turn a darker yellow; add 1 cup water to the pot, bring to a boil, and cook until tender, about 15 minutes. Drain.
Mash plantains, milk, and butter together in the pot until smooth.
Heat oil in a large skillet over medium heat. Cook and stir ground beef, onion, bell pepper, tomato sauce, garlic, and chicken bouillon, adding water if mixture gets too dry, in hot oil until beef is browned and cooked through, 10 to 12 minutes.
Spread 1/2 of the mashed plantains into the bottom of the prepared baking dish. Pour meat mixture over the plantains and top with Cheddar cheese. Spread remaining mashed plantains over the cheese.
Bake in the preheated oven until plantains are golden and filling is bubbling, about 10 minutes.
Nutritional Facts
Per 6 servings
Calories: 783
Carbohydrate: 101g
Fat: 35g
Fiber: 8g
Protein: 27g
Sugar: 48g
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Sautéed Sweet Plantains (Tajaditas Dulces de Platano)