In the last 10 minutes of cooking, add the frozen veggies, stir, and cover.
Transfer mixture to baking dish and top with mashed potatoes. Season with salt and pepper. Place on a baking sheet to catch overflow and bake for 10-15 minutes or until the mashed potato is lightly browned on top.
To thicken the mixture, add 2-3 Tbsp mashed potatoes and stir. Alternatively, scoop out some of the mixture and whisk in cornflour, return to the pan and whisk to thicken.
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