Mushroom Wellington: The Ultimate Vegetarian Thanksgiving Showstopper

Name: Mushroom Wellington: The Ultimate Vegetarian Thanksgiving Showstopper
Ingredients: 1 sheet frozen regular or vegan puff pastry (from a 17.3-ounce package); 2 portobello mushrooms (about 6 ounces total); 3 tablespoons olive oil, divided; 1 1/2 teaspoons kosher salt, divided; 1 teaspoon freshly ground black pepper, divided; 2 (10-ounce) packages cremini mushrooms; 3 cloves garlic; 1 medium shallot; 1 tablespoon fresh thyme leaves; 1 tablespoon fresh rosemary leaves; 8 ounces fresh oyster or shiitake mushrooms; 2 tablespoons unsalted butter or vegan butter; 2 cups packed baby kale (2 ounces); 2 tablespoons Dijon mustard; 1 large egg