2 (1 inch) thick slices cooked leftover prime rib, cut into 1-inch cubes
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1 ½ cups leftover mashed potatoes, or more to taste
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salt and ground black pepper to taste
Instructions
Melt butter in large skillet over medium heat. Add water and minced garlic; stir for 1 minute. Add mushrooms, cover, and cook, stirring occasionally, until mushrooms are tender, about 5 minutes. Add prime rib and mashed potatoes and turn heat to low. Cook, stirring occasionally, until everything is heated through, 5 to 7 minutes. Season with salt and pepper.