Bake the chicken for 20-25 minutes or until fully cooked. Allow it to cool, then shred the chicken using two forks.
Prepare the Vegetables:
If using frozen mixed vegetables, thaw them according to the package instructions. Alternatively, you can use fresh vegetables by chopping them into bite-sized pieces.
Make the Filling:
In a large skillet, melt the butter over medium heat.
Stir in the flour and cook for 1-2 minutes to create a roux.