01 - Set the oven to 350°F (180°C).
02 - Slice off the tops of the bell peppers and remove seeds and membranes. Set aside.
03 - Heat olive oil in a large skillet over medium heat. Add chopped onion and sauté for 3 minutes until softened.
04 - Add minced garlic to the skillet and cook for 1 minute. Incorporate ground beef and cook until browned, breaking up with a spoon.
05 - Stir in diced zucchini and tomato; cook for 3 minutes until slightly softened.
06 - Mix in rinsed rice, tomato paste, parsley, mint, oregano, cumin, cinnamon, salt, and pepper. Cook for 2 to 3 minutes, stirring well.
07 - Take the skillet off the heat and prepare to stuff the peppers.
08 - Stuff each bell pepper with the beef and vegetable mixture, pressing gently to compact.
09 - Stand the stuffed peppers upright in a baking dish.
10 - Pour chicken or vegetable broth into the base of the baking dish around the peppers.
11 - Sprinkle crumbled feta cheese and pine nuts evenly over the stuffed peppers.
12 - Cover the dish loosely with aluminum foil and bake for 35 minutes.
13 - Remove the foil and continue baking for an additional 10 minutes until peppers are tender and feta is lightly golden.
14 - Allow the stuffed peppers to rest for 5 minutes prior to serving.