Creamy white wine sauce is the hero of this classic main dish. Recipe: Extract from Magnolia Table, Volume 2 by Joanna Gaines Photo: Amy Neunsinger Prep: 15 minutes Cook: 40 minutes Cool: None INGREDIENTS 2 tablespoons olive oil 4 boneless, skinless chicken breasts (about 6 ounces each) 1 teaspoon freshly ground black pepper 2¾ teaspoons kosher salt ½ cup all-purpose flour 2 tablespoons unsalted butter ½ cup minced shallots (about 2 large) 3 garlic cloves, minced 1 cup good-quality dry white…