Caramelize onions in a skillet with olive oil and butter on low heat for 45 minutes. Set aside half.
Stir flour into the skillet, then whisk in beef stock, Worcestershire sauce, cheese, and parsley. Cook until thickened. Season.
Preheat oven to 350°F.
Combine meatloaf ingredients in a bowl. Form into a loaf on a parchment-lined baking sheet. Bake for 1 hour.
Serve meatloaf with gravy.
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