Mary Berry's hearty beef casserole dish with horseradish and mustard ... sauce One tbsp light muscovado sugar Salt and freshly ground black pepper 500g chestnut mushrooms, halved Three tbsp ...
For the casserole: Preheat the oven to 375°F ... For the topping: In a small bowl, stir together the fried onions, potato chips, and parmesan. Sprinkle the mixture evenly over the top of the ...