Preheat oven to 375°F.
In a medium saute pan over medium heat, add olive oil and onion. Saute for 3-4 minutes until soft, then add garlic, mushrooms and butternut squash. Stir occasionally until vegetables begin to brown, then add spinach,and stir until it wilts. Remove from heat and set aside.
In a large bowl, combine ground beef, bread crumbs, eggs, apple cider vinegar and 1 tablespoon of ketchup with a wooden spoon. Add vegetable mixture, salt, and pepper to the ground beef. Using very clean hands, mix until ingredients are combined.
Line two muffin tins using paper muffin cup liners. Scoop the meat mixture with an ice cream scoop, and top with the remaining ketchup using a basting brush and bake for 30 minutes or until the internal temperature of the meatloaf muffins reaches 170° F. When done, remove from oven, and let cool for 5 minutes before serving.
You can serve these delicious meatloaf muffins with a bowl of Creamy Turmeric Cauliflower-Carrot Soup.
Serving size: 4 muffins Calories: 420 calories, Fat: 18 grams, Saturated fat: 6 grams, Carbohydrates: 40 grams, Sugar: 4 grams, Sodium: 460 milligrams, Fiber: 6 grams, Protein: 24 grams, Cholesterol: 140 milligrams