Easy Chicken and Corn Chowder
1 clove garlic, minced 1 pinch nutmeg 1 small carrot, finely diced 1 small onion, finely diced 1 stalk celery, diced 1 ½ cups white corn kernels 1 ½ cups yellow corn kernels 2 cooked rotisserie chicken breast halves, sh… 2 ½ cups half-and-half 4 cups chicken stock, divided 4 russet potatoes, diced salt and ground black pepper to taste ½ cup all-purpose flour ½ cup butter