Recipe courtesy of Cooking Channel

Mushroom and Green Bean Casserole Wellington

Getting reviews...
Take the classic side dish out of the casserole and wrap it in a blanket of puff pastry for a creamy green bean-and-mushroom pie that could be served sliced or eaten handheld (we won't tell). Snappy beans and tough-yet-tender mushrooms are perfectly complemented by the buttery, flaky crust.
  • Level: Intermediate
  • Total: 1 hr 30 min
  • Prep: 15 min
  • Inactive: 20 min
  • Cook: 55 min
  • Yield: 6 to 8 servings
Share This Recipe



  1. Bring a medium pot of salted water to a boil. Add the green beans, and cook until bright green and tender-crisp, 2 to 3 minutes. Strain the beans in a colander, and run cold water over them until cooled. Season with 1/4 teaspoon kosher salt and a few grinds of pepper; set aside. 
  2. Heat the oil and butter in a large skillet over medium heat. Add the shallots, and cook, stirring frequently, until soft, about 3 minutes. Cut each Portobello cap in half, cut crosswise into 1/4-inch-thick slices and add to the skillet; season with 1/2 teaspoon kosher salt and a few grinds of pepper. Cook, stirring frequently, until the Portobellos have started to soften and wilt, about 4 minutes. Add the shiitakes, thyme, 1/2 teaspoon kosher salt and a few grinds of pepper, and cook, stirring frequently, until the shiitakes have started to soften and wilt, about 3 minutes. Pour in the wine, bring to a simmer and stir until the liquid has evaporated, 2 to 3 minutes. Stir in the flour until the mushrooms are coated. Slowly stir in the half-and-half. Cook until thickened, about 3 minutes. Stir in the green beans, then remove the skillet from the heat and transfer the mixture to a large bowl. Let cool completely, then stir in 1 tablespoon of the breadcrumbs. 
  3. Position an oven rack in the center of the oven, and preheat to 400 degrees F. Roll the puff pastry out on a floured sheet of parchment paper to a 13-inch square. Brush the surface of the pastry with the mustard, and sprinkle with the remaining 1 tablespoon breadcrumbs. 
  4. Leaving a 1-inch border on the left and right sides of the pastry, pile the mushroom filling onto the puff pastry across the center, and shape it into a log about 3 inches wide. Fold the bottom half of the pastry over the filling, then roll it up so the bundle sits seam-side down. (You can use the parchment paper to help roll.) If any filling falls out while rolling, just push it back inside. Pinch together the open ends to seal, and crimp with a fork. The log should be about 12 inches long. Transfer the Wellington, on the parchment, to a baking sheet. Brush generously all over with the egg. Cut decorative slits down the length of the Wellington. Lightly sprinkle with sea salt and pepper. Bake until golden brown and bubbly, 30 to 35 minutes. Let rest for a few minutes. 

Fudge Factor

Chocolate Desserts

Indulge in our decadent chocolate desserts, from cookies and cakes to puddings, souffles and truffles.

Review: Anthony Bourdain and Eric Ripert's Chocolate Bar Nov 16, 2012

Anthony Bourdain and Eric Ripert have teamed up with master chocolatier Christopher Curtin to create the "Good & Evil" chocolate b …

How to Chop and Melt Chocolate

Lots of recipes call for melted chocolate. Follow these step-by-step instructions to do it properly.

How-To: Chocolate Cream Puffs

Make this classic and elegant French dessert using our step-by-step guide.

Over-the-Top-Delicious Treats to Satisfy Your Food Obsession

Are you infatuated with ice cream? Do you lust over lobster? Swoon at the sight of chocolate? Here's the best recipe for each food …

The Craziest Chocolate Creations for American Chocolate Week Mar 17, 2013

It’s officially American Chocolate Week. Check out photos of mind-blowing chocolate creations.

Valentine's Day Four-Ingredient Dessert Feb 12, 2013

By: Cameron Curtis

The best part of this Valentine's Day dessert? It requires only four ingredients: chocolate, butter, eggs and sugar.

Sifted: Plan-Ahead Valentine's Day Desserts Feb 6, 2013

By: Lauren Miyashiro

Get our take on the best in food news, recipes and more from around the web, including the best Valentine's Day recipes.

Nostalgic, Old-Fashioned and Retro Candy and Candy Bars

Take a sweet trip down memory lane by ogling these old-school candy bars and confections.

Essentials: Chocolate Basics Sep 1, 2016

Satisfy that chocolate craving in your very own kitchen. All you need is baking chocolate and a little know-how. It also helps to …

How to Make Truffles

Learn how to make a chocolate lover's favorite treat: the classic truffle made from smooth chocolate ganache.

Easy Gift Idea: Chocolate-Covered Toffee Feb 7, 2013

Looking for an easy gift idea? Cooking Channel's recipe for Chocolate-Covered Toffee is just the ticket. A touch of coffee in the …