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1
Preheat oven to 400u00b0F.
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2
Place potatoes in a pot, cover them with water, then bring water up to a boil; salt it and cook potatoes until fork-tender, 10 to 12 minutes or so.
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3
While the potatoes are working, combine veal with egg, bread crumbs, 1/2 cup cheese, sage, salt, and black pepper. Form 4 (1-inch thick) oval shaped meat loaves. Heat a large nonstick skillet over medium-high heat with 2 tablespoons extra-virgin olive oil, 2 turns of the pan. Brown meatloaves 2 to 3 minutes on each side then transfer to a nonstick baking sheet and finish in the oven, 6 to 8 minutes. Return skillet to heat, add another turn of extra-virgin olive oil to the pan and the mushrooms and the garlic. Cook mushrooms until dark and tender, 5 to 6 minutes, then add salt and pepper and 1 cup chicken stock to deglaze the pan.
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4
While the mushrooms cook, melt butter over medium heat in a medium saucepot. Add flour and cook 1 to 2 minutes. Whisk in milk and season with nutmeg, salt, and pepper. Reduce the sauce a few minutes to thicken a bit.
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5
Drain potatoes and add them back to warm pot. Add half of the milk sauce to potatoes with prosciutto and remaining 1/2 cup cheese, a couple of handfuls. Smash the potatoes to desired consistency and season with salt and pepper to taste.
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6
Add the remaining milk sauce to the mushrooms, stir in Gorgonzola cheese to melt, then add the broth and combine. Serve the meatloaves with Gorgonzola-mushroom gravy over top and prosciutto potatoes alongside.
