PREHEAT oven to 375°F. Place plantains in 13x9-inch baking dish. Bake 20 min. Cool. Cut in half lengthwise across “belly.” Starting at corner of one half, slide thumb in between peel and plantain. Gently lift to loosen plantain from peel, but let plantain remain in peel. Place plantain halves in baking dish; set aside.
COOK onions and garlic in dressing in large saucepan on medium-high heat 3 min. Add meat and oregano; cook 10 min. or until meat is cooked through, stirring frequently. Reduce heat to medium-low; add tomatoes and 1/2 cup of the cheese.
SPOON mixture evenly on top of plantain halves. Sprinkle with bacon and remaining 1/2 cup cheese. Bake 5 min. or until cheese is melted.