These stuffed portobello mushrooms are a delicious and healthy vegetarian option. The mushrooms are stuffed with a mixture of spinach, feta cheese, and garlic, which adds a burst of flavor to every bite. The mushrooms are then baked in the oven until they are tender and juicy. This dish is perfect for a quick and easy weeknight dinner, and it is also great for meal prep. Serve it with a side of roasted vegetables or a salad for a complete and nutritious meal.