Vegetable Pot Pie Recipe

Ingredients

• 1 package (2 sheets, 17.3 ounces) puff pastry sheets, thawed
• 1/3 cup unsalted butter
• 1 cup diced red onions, 1/4-inch dice
• 1 cup diced carrots, 1/4-inch dice
• 1/2 cup diced celery, 1/4-inch dice
• 1 tablespoon minced garlic
• 1/2 teaspoon dried thyme
• 8 ounces sliced brown mushrooms
• 1 1/2 pounds russet potatoes, 1/4-inch dice
• 1 teaspoon kosher salt
• 1/2 teaspoon black pepper
• 1/3 cup flour
• 1 1/2 cups vegetable stock
• 1 cup whole milk, plus 1 tablespoon for egg wash
• 1 cup peas
• 1 tablespoon chopped parsley
• 1 large egg, whisked