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Caramelize onions: In a skillet, heat olive oil and butter on low heat. Add onions and cook for 45 minutes, stirring occasionally, until deeply caramelized. Reserve half of the caramelized onions for the meatloaf.
Prepare the gravy: In the same skillet, stir in flour. Gradually whisk in beef stock, Worcestershire sauce, grated Gruyere cheese, and chopped parsley. Cook until the gravy has thickened. Season with salt and pepper to taste.
Preheat the oven to 350Β°F (175Β°C).
Make the meatloaf: In a bowl, combine the ground meatloaf mix, reserved caramelized onions, egg, minced garlic, parsley, thyme, milk, Worcestershire sauce, breadcrumbs, grated Gruyere cheese, black pepper, and salt. Mix until well combined.
Shape the mixture into a loaf and place it on a parchment-lined baking sheet.
Bake in the preheated oven for 1 hour, or until cooked through and browned on the outside.
Serve the meatloaf with the prepared gravy.
Prep Time: 25 mins | Cook Time: 1 hr 45 mins | Total Time: 2 hrs 10 mins | Servings: 8
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