These vegetarian stuffed bell peppers are filled with a delicious mixture of sautéed spinach, mushrooms, onions, garlic, and cheese. The combination of flavors creates a savory and satisfying filling that pairs perfectly with the sweet and crunchy bell peppers. This recipe is a great option for a meatless meal and can be easily customized by adding additional ingredients such as quinoa or roasted red peppers. Serve these stuffed bell peppers with a side of marinara sauce or a fresh green salad for a complete and nutritious meal.