Ingredients
- 4 pounds russet potatoes, peeled and chopped into 1-inch pieces (about 5 large)
- 6 tablespoons unsalted butter, cut into 1/2-inch pieces, at room temperature
- 2 cloves garlic, peeled and smashed
- Kosher salt
- 1 cup mascarpone, at room temperature
- 3/4 cup grated Parmesan
- 1/2 cup low-sodium chicken broth
- Freshly ground black pepper
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