Step 1

Preheat oven to 375 degrees.

Step 2

Melt butter in a nonstick skillet over medium heat. Add onion and celery and cook for 5 minutes. Season with a little salt and pepper.

Step 3

Transfer mixture to a 9x13-inch baking pan. Spread evenly.

Step 4

Add chicken to baking dish and spread evenly.

Step 5

In a medium bowl, whisk together flour and milk. Slowly pour evenly over chicken. Do not stir.

Step 6

In a medium bowl stir together chicken broth, chicken soup,and sage. (You can use the bowl you just used.) Slowly pour into baking pan. Do not stir.

Step 7

Bake uncovered for 35 to 45 minutes. Let sit 5 minutes before serving.