- Blend together broth, flour and salt until smooth.
- Sauté celery in hot oil in large skillet over high heat 1 minute. Add mushrooms, onion and garlic; sauté 2 minutes longer. Stir in tofu and stir-fry sauce.
- Stir broth mixture; pour into skillet. Bring to boil; cook, stirring, 1 minute. Stir in peas and carrots. Pour into 2-quart round casserole dish.
- Top with pie crust; fold under excess dough and flute edges, pressing dough onto dish. With sharp knife, make six 3-inch long slits in crust.
- Bake in 400°F oven 30 minutes, or until crust is golden brown. (Cover edges with foil after 20 minutes if crust browns too quickly.)
- Let stand 5 minutes before serving.