If you would like to get a head start on this classic casserole, then you can caramelize the onions in advance, and simply toss with the green beans when you're ready to assemble the dish.
things you'll need.
1 1/2 pounds Green Beans (ends trimmed; cut into roughly 1-inch pieces)
2 large Sweet Yellow Onions (halved and sliced)
1 minced Garlic clove
1/2 cup White Wine
3 tablespoons Butter (divided)
2 tablespoons All-Purpose Flour (plus more for rolling)
1 3/4 cups Whole Milk
8 ounces high quality shredded Cheddar blend
1 tablespoon Dijon
3 dashes Hot Sauce
1/4 cup Parmesan cheese (divided)
1 sheet Frozen Puff Pastry (thawed)
1 Egg (beaten)
Kosher Salt and freshly cracked Black Pepper
9x13 pan/ sheet
Liquid Measuring Cup
Measuring Cup (set)
step by step directions. We've Made Cooking As Easy As 1-2-3!print recipe
ingredients 3 tablespoons Butter (divided) 2 large Sweet Yellow Onions (halved and sliced) Kosher Salt 1 minced Garlic clove 1/2 cup White Wine
instructions Melt one tablespoon of butter in a large sauté pan over medium heat add onions and salt. Cook until brown and caramelized. Add garlic, cook for one minute, or until garlic is soft. Deglaze pan with white wine, and then reduce by half.
ingredients 1 1/2 pounds Green Beans (ends trimmed; cut into roughly 1-inch pieces)
instructions Meanwhile, blanch green beans in salted boiling water. Plunge green beans into an ice bath. Drain beans, and then toss in pan with onions until beans are coated with onions and wine reduction. Transfer mixture to a 9x13 casserole dish. Set aside.
ingredients 2 tablespoons All-Purpose Flour (plus more for rolling) 1 3/4 cups Whole Milk 1 tablespoon Dijon 8 ounces high quality shredded Cheddar blend 1/4 cup Parmesan cheese (divided) Kosher Salt and freshly cracked Black Pepper 3 dashes Hot Sauce
instructions For the sauce, melt the remaining two tablespoons of butter in saucepan, add flour and cook, while whisking for a couple of minutes over medium heat, or until the mixture is golden brown. Slowly whisk in milk, and cook until thickened. Add mustard, cheddar, and two tablespoons parmesan stir until melted. Add salt, pepper, and a few dashes of hot sauce to taste.
instructions Pour cheese mixture over beans and onions. Press down with spoon to create an even layer. On a floured surface, roll out puff pastry to the size of the casserole dish. Cover dish with one sheet of puff pastry, folding the edges over the side. Brush egg wash over puff pastry, sprinkle with parmesan cheese and black pepper.
instructions Place dish on a baking sheet and bake in 400 degree oven for 20-25 minutes, or until golden brown.