Summer Corn and Cod Chowder

Name: Summer Corn and Cod Chowder
Ingredients: 3 slices center-cut bacon, halved crosswise; 8 scallions, thinly sliced, whites and greens separated; 1 1/2 teaspoons finely chopped garlic; 2 tablespoons all-purpose flour; 2 medium Yukon gold potatoes, peeled and cut in 1/2-inch dice; 2 cups 2 percent milk; 2 cups reduced-sodium chicken broth; 2 teaspoons finely chopped fresh thyme; 3/4 teaspoon kosher salt; 1/4 teaspoon freshly ground black pepper; 3/4 pound cod, skin removed, chopped; 2 1/2 cups cups fresh or frozen corn kernels; 1/4 cup fat-free half-and-half