Caramelize Onions: In a skillet, heat olive oil and butter on low heat. Add the sweet onions and cook slowly for about 45 minutes, stirring occasionally until golden and caramelized. Set aside half of the onions for the meatloaf.
Prepare Gravy: Stir flour into the skillet with the remaining onions and cook for 1-2 minutes. Gradually whisk in the beef stock and Worcestershire sauce, continuing to whisk until smooth. Add grated Gruyere cheese and chopped parsley, and cook until the gravy is thickened. Season with salt and pepper to taste. Keep warm.
Prepare Meatloaf: Preheat the oven to 350°F (175°C). In a large mixing bowl, combine the ground meatloaf mix, the caramelized onion set aside earlier, egg, minced garlic, chopped parsley, thyme, milk, Worcestershire sauce, breadcrumbs, grated Gruyere cheese, ground black pepper, and salt. Mix until just combined.
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