VEGETABLE FILLING
Preheat oven to 350°F.
Whisk potato starch into red wine and set aside.
Lightly coat a large pan with evoo and place over medium heat. Sauté vegetables in batches until golden brown, seasoning each batch with slat and pepper.
Add garlic and tomato paste to the last batch toward the end of cooking so as not to burn it.
Transfer vegetables to a casserole and pour wine mixture over veggies. Top with Potato Crust (instructions below)
Whisk eggs and milk together. Brush crust with egg wash (optional).
Bake in a 350°F oven for 30 to 45 minutes or until potatoes are golden brown and vegetables are bubbly.
POTATO CRUST
Place butter and evoo in a Dutch oven over medium heat. Once butter melts, add garlic and sweat for 5 minutes until translucent.
Add potatoes, milk, and chestnuts. Reduce heat, cover, and simmer until potatoes are cooked and falling apart and milk has been mostly absorbed.
Puree or mash potatoes with melted butter and season with salt and pepper.
Use potatoes to top vegetable pot pie.
GLAZE
Whisk eggs and milk together.
Pile potatoes on top of vegetables. Brush potatoes with egg wash and bake for 35-45 minutes or until potatoes are golden brown and vegetables are bubbly.