Follow these simple steps to create your delicious Roasted Vegetable Pot Pies:

1. Preheat the Oven: Begin by preheating your oven to 400°F (200°C).
2. Prepare the Vegetables: Chop the mixed vegetables into small, even pieces. This ensures they cook uniformly.
3. Roast the Vegetables: On a baking sheet, toss the chopped vegetables with 2 tablespoons of olive oil, salt, and pepper. Roast in the oven for 20-25 minutes, or until they are tender and slightly caramelized.
4. Sauté the Onions and Garlic: In a large skillet, heat 1 tablespoon of olive oil over medium heat. Add the diced onion and sauté until translucent. Stir in the minced garlic and cook for another minute until fragrant.
5. Make the Sauce: Sprinkle the flour over the onions in the skillet and stir to combine. Gradually whisk in the vegetable broth and milk until smooth. Add thyme, soy sauce, and adjust seasoning to taste. Cook until the sauce thickens, about 3-5 minutes.
6. Combine Filling: Add the roasted vegetables and frozen peas into the sauce, stirring well to combine. Remove from heat and let cool slightly.
7. Prepare the Pie Crusts: Roll out the pie crusts as needed. If using a store-bought version, follow package instructions.
8. Assemble the Pot Pies: Divide the vegetable filling evenly into individual ramekins or a large pie dish. Cover with pie crust, sealing the edges. Cut small slits in the top crust to allow steam to escape.
9. Brush with Egg Wash: If using, whisk the egg and brush it over the crust for a golden finish.
10. Bake: Place the pot pies in the preheated oven and bake for 25-30 minutes, or until the crust is golden brown.
11. Cool and Serve: Remove the pot pies from the oven and let them cool for about 15 minutes before serving.

These steps will guide you to create mouth-watering Roasted Vegetable Pot Pies that are sure to impress!