Spreading the meatloaf out in a sheet pan makes for a much faster cooking time, as well as more surface area for the tangy Dijon balsamic sauce and melted cheese. This recipe yields enough for a crowd -- or for excellent meatloaf sandwiches the next day.
Position an oven rack in the upper third of the oven and preheat to 375 degrees F.
Mix together the breadcrumbs, milk, parsley, eggs, 1/4 cup of the French Style Dijon Balsamic Vinaigrette and 1/4 cup of the ketchup in a large bowl. Set aside until the breadcrumbs have absorbed the liquid, about 3 minutes.
Add the meatloaf mix, garlic, onion, 1 tablespoon salt and 1/2 teaspoon pepper to the bowl and mix until well combined (take care not to overmix). Transfer the mixture to an 18-by-13-inch sheet pan and press into an even layer covering the entire surface.
Whisk together the remaining 1/2 cup French Style Dijon Balsamic Vinaigrette and 1/4 cup ketchup in a small bowl. Brush the meatloaf with the sauce.
Bake until cooked through, about 20 minutes, then turn the oven to broil. Scatter the cheese over the top and broil, turning the pan periodically for even browning, until the top is caramelized and dark in spots and the cheese is melted, 3 to 4 minutes. Sprinkle with chopped parsley.
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