In a large skillet, heat the butter over medium-high heat until it starts to shimmer. Add the onion, carrots, celery, salt, and pepper and cook for 10 to 12 minutes until the vegetables start to soften.
3 tablespoons unsalted butter, 1 onion, 2 carrots, 2 stalks celery, 2 teaspoons kosher salt, 1 teaspoon black pepper
Add the cream of chicken soup, milk and cooked chicken and cook until heated throughout and the sauce begins to thicken, about 3 to 4 minutes. Set aside to let cool slightly.
1 can cream of chicken soup, ½ cup milk, 3 cups shredded cooked rotisserie chicken
Preheat the oven to 350 degrees Fahrenheit.
Roll out one can of the crescent rolls over the bottom of a greased 13 x 9 baking dish.
2 cans refrigerated crescent roll dough, Cooking spray
Top with the pot pie mixture.
Unroll the second roll of crescent dough over the top, gently stretching it to the edge of the pan. Spray the top with cooking spray.
Bake until the top is golden brown, 25 to 30 minutes. Let rest 5 to 6 minutes before serving.