Preheat the oven to 350 degrees Fahrenheit. Butter an 8-inch square baking dish.
To make the topping, combine the butter, sugar, flour, oats and cinnamon in a bowl. Work together with fingertips until the mixture resembles a coarse meal. Toss in the walnuts; set aside.
Toss the apples with lemon juice and spoon into the baking dish. Sprinkle the topping evenly over the apples. Bake in the center of the oven for 1 hour or until bubbly and the apples are tender. Let cool slightly. Serve warm, topped with ice cream or cream, if desired.
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