4 tablespoons butter 1 medium onion , chopped (about 1 cup) 4 garlic cloves, chopped 1 teaspoon seasoning salt 1 teaspoon Kosher salt ½ teaspoon black pepper 4 tablespoons all-purpose flour 3 ½ cups chicken stock 3 ½ cups milk 1 ½ cups uncooked long-grain rice 3 cups cooked chicken , cubed 1 1/2 cups... more