Preheat oven to 350 degrees, grease a 2-3 quart baking dish with oil
In large skillet, over medium heat, Add onion, red and green pepper and cook stirring occasionally until softened (about 3-5 minutes). Add ground beef and cook, breaking up meat with wooden spoon until meat is cooked through and browned (about 6-8 minutes). Add tomato paste, salt, cumin, paprika, black pepper, garlic; cook, stirring frequently until fragrant. Add tomatoes and zucchini and cook until softened (about 3-5 minutes).
Stir in chicken broth, rice, parsley, Worcestershire sauce, and 1 cup of the cheese. Remove from heat and spoon mixture into the prepared baking dish and cover with aluminum foil.
Bake until rice is tender and the liquid is absorbed, 50 minutes to 1 hour. Remove foil and stir the casserole. Sprinkle with remaining cheese and increase oven to broil.
Broil until the cheese is melted and bubbly, about 2-3 minutes. Allow to cool at least 5 minutes before sprinkling with more parsley before serving.