Step 1

Preheat the oven to 350°F. Grease a 2-to-3-quart baking dish with oil.

Step 2

In a large skillet, heat the oil over medium heat. Add the onion, red bell pepper, and green bell pepper and cook, stirring occasionally, until softened, 3 to 5 minutes. Add the ground beef and cook, breaking up the meat with a wooden spoon, until the beef is cooked through and browned, 6 to 8 minutes. Add the tomato paste, salt, cumin, paprika, black pepper, and garlic; cook, stirring frequently, until fragrant. Add the tomatoes and zucchini and cook until softened, 3 to 5 minutes.

Step 3

Stir in the chicken broth, rice, parsley, Worcestershire sauce, and 1 cup of the cheese. Remove from heat and spoon the mixture into the prepared baking dish and cover with aluminum foil.

Step 4

Bake until the rice is tender and the liquid is absorbed, 50 minutes to 1 hour. Remove the foil and stir the casserole. Sprinkle with the remaining 1 cup cheese. Increase the oven to broil.

Step 5

Broil until the cheese is melted and bubbly, 2 to 3 minutes. Allow to cool 5 minutes before sprinkling with more parsley and serving.