Sweet Plantain Casserole Recipe

Name: Sweet Plantain Casserole Recipe
Ingredients: 4 sweet, ripe plantains; 3 tablespoons unsalted butter, softened, plus more for greasing; 1/4 cup canola oil; 1 pound ground beef; 1 red onion, diced; 1 green bell pepper, diced; 2 garlic cloves, minced; 1½ teaspoons ground oregano; 1½ teaspoons ground paprika; kosher salt, to taste; freshly ground black pepper, to taste; 3/4 cup tomato sauce; 1/3 cup stuffed olives; 1/3 cup water; 2 cups shredded mozzarella cheese; 1 cup Parmesan cheese