Prepare the pie crust

• With a whisk, combine the flour and salt
• Add the cold, cubed butter and cut in with a pastry cutter until the mixture resembles coarse crumbs
• Slowly add ice water, one tablespoon at a time and stir with a wooden spoon until the dough comes together.
• Divide the dough in half, shape each into a disk, wrap in plastic wrap.
• Refrigerate for at least 30 minutes.
• After the dough has thoroughly chilled, on a floured surface, roll out one of the chilled pie crust disks to fit the size of your baking dish. Pat one disk to line the baking dish.

Prepare the Filling

• Sauté
• In a large skillet, heat olive oil over medium heat. Add the chopped shallot and sauté until softened. Add the minced garlic and cook for an additional 1-2 minutes.
• Add Mushrooms and Vegetables
• Add the sliced mushrooms, carrots, and celery to the skillet. Cook for about 5-7 minutes until the vegetables are tender and the mushrooms release their moisture.
• Make the Roux
• Sprinkle the flour over the vegetable mixture and stir to coat. Cook for 2-3 minutes to eliminate the raw flour taste. Add the tomato paste and stir.
• Pour in Guinness and Broth
• Gradually pour in the Guinness stout, stirring constantly to avoid lumps. Add the vegetable broth and dried thyme. Simmer the mixture for 10-15 minutes, allowing it to thicken. Season with salt and black pepper to taste. Stir in the frozen peas and remove the skillet from heat.
• Preheat the Oven
• Preheat your oven to 400°F (200°C).
• Assemble the Pot Pie
• Pour the mushroom and vegetable filling into a baking dish with the bottom crust already in place. Place the remaining rolled-out pie crust on top, trimming any excess and crimping the edges. Brush with beaten egg white and cut a few slits in the middle of crust to allow steam to escape.
• Bake
• Bake in the preheated oven for 25-30 minutes or until the crust is golden brown and the filling is bubbly.
• Serve
• Allow the pot pie to cool for a few minutes before serving. Enjoy your Vegetarian Mushroom Guinness Pot Pie with a rich and savory filling and a flaky crust!