225g crushed buttery round crackers, such as Ritz's
4 tablespoons melted butter
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Method Prep:20min › Cook:30min › Ready in:50min
Preheat an oven to 180 C / Gas 4.
Melt 30g butter in a frying pan over medium heat. Cook and stir the onions, parsley and mushrooms in the melted butter until the onions are translucent and the mushrooms are giving off their juices, 7 to 10 minutes.
Add the flour, salt, pepper and lemon juice; cook until the flour is slightly browned, 2 to 3 minutes. Stir the soured cream into the mixture. Mix the green beans into the mixture. Pour the green bean mixture into a 23cm square baking dish. Sprinkle the Cheddar cheese over the mixture. Stir the crackers and melted butter together in a small bowl until evenly mixed; spread evenly over the Cheddar cheese layer.
Bake in the preheated oven until bubbly and brown, 20 to 30 minutes.