Heat oil in a skillet over medium-high heat and add the beef, mushrooms, and onion, cooking until beef is browned. Drain fat.
Meanwhile, mix together the gravy, cornstarch, sugar, and pepper. Add to the beef and stir. Add in the vegetables and and cook until vegetables are thawed.
Line a pie dish with one of the crusts. Top with the meat mixture and press the second crust on top, cutting air holes for steam to escape. Bake 40 minutes until pie crust is golden brown. Serve.
Notes
If the crust is browning too fast, cover with foil.
The cornstarch has to be blended pretty well otherwise it will clump.
Perfect Pairing
Love Slow Cooking? You've got to try out this Slow Cooker Spicy Potato Korma.
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