This one-skillet chicken pot pie delivers all the comfort of the classic with tender chicken and vegetables in a creamy sauce. A protein-packed family dinner topped with flaky biscuit crust.
Preheat oven to 400°F. Cut chicken breast into bite-size pieces; season lightly with salt and pepper.
In a large oven-safe skillet over medium-high heat, melt 2 tbsp butter. Add chicken and cook until just cooked through, about 6 minutes. Transfer chicken to a plate and set aside.
Reduce heat to medium and add remaining 1 tbsp butter. Sauté onion and celery for 4 minutes until softened but not browned.
Sprinkle in flour and thyme, stirring constantly for 2 minutes to form a pale roux. Gradually whisk in milk and chicken broth, ensuring no lumps form.
Add frozen vegetables and bring mixture to a gentle simmer. Stir in cooked chicken, simmering for 3-4 minutes until the sauce thickens and vegetables are tender.
Season with remaining salt and pepper. Place biscuit dough pieces evenly on top of the filling.
Transfer skillet to oven. Bake for 16-18 minutes, until biscuits are puffed and golden and filling is bubbling at the edges.
Let rest for 5 minutes before serving to allow the sauce to set slightly.