Mashed Potatoes with Green Chile Queso Sauce

Name: Mashed Potatoes with Green Chile Queso Sauce
Ingredients: 4 large Yukon Gold potatoes, peeled and cut into 2-inch pieces; Kosher salt; 8 tablespoons butter, cold, cut into pats; 2 tablespoons all-purpose flour; 1 cup milk, scalded; 3/4 to 1 cup shredded Monterey Jack cheese; 1/4 cup grated Parmigiano-Reggiano; 1 poblano chile, roasted, and then peeled, seeded and finely diced; Freshly ground black pepper; 1/2 to 3/4 cup cream, warmed; Chopped fresh cilantro, for garnish