Step 1

Heat oven to 350°F. Spray 13x9-inch (3-quart) glass baking dish with cooking spray.

Step 2

Pierce sweet potatoes with fork; place on cookie sheet. Bake 50 to 60 minutes or until potatoes can be easily pierced with a knife. Cool 20 minutes. Peel potatoes; cut each into 1/4-inch slices.

Step 3

Meanwhile, in 2-quart saucepan, melt butter over medium heat. Stir in flour, salt and pepper using whisk. Cook until smooth and bubbly, stirring frequently. Gradually stir in half-and-half, stirring frequently, 5 to 7 minutes or until slightly thickened. Stir in 1 cup of the cheese.

Step 4

In large bowl, toss potatoes, half-and-half mixture, kale and chicken until well coated. Spoon into baking dish. Sprinkle with remaining 1 cup cheese.

Step 5

Bake 25 to 30 minutes or until thoroughly heated and cheese is melted. Let stand 15 minutes before serving.