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Method Prep:10min › Cook:40min › Ready in:50min
Preheat an oven to 180 C / Gas 4.
Heat the olive oil in a frying pan over medium heat. Cook the chicken until no longer pink in the centre and the juices run clear, 5 to 7 minutes; drain and set aside.
Toss the bread pieces, Cheddar cheese and 60g melted butter together in a bowl; spread about half of the mixture into the bottom of a 20x30cm baking dish. Layer the peas and chicken atop the bread layer.
Melt remaining 60g butter in a saucepan over medium heat; stir the flour, milk, salt and pepper into the melted butter. Cook and stir the sauce until smooth and thick, 5 to 7 minutes. Pour over the casserole. Top with the remaining bread mixture.
Bake in the preheated oven until the top begins to brown, 30 to 40 minutes.