Combine ⅓ cup walnuts, ⅓ cup flour, ½ cup brown sugar, 1 cup oatmeal, ½ tsp salt, ¾ tsp baking powder and ¼ cup (½ stick) butter. Mix until it’s crumbly.
Peel and cut up 4 cups of fresh fruit (peaches, apples, pears or whatever you like). Mix with ½ cup sugar, 1 tsp lemon juice, 1 to 2 TBL cornstarch, ¼ tsp salt and ¼ tsp nutmeg. Place fruit mixture in buttered casserole. Cover with crumb topping.
Bake at 375º F until bubbly, about 30 to 45 minutes.