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Combine flour, brown sugar, and salt. Cut in butter until crumbly; set aside 1/4 cup crumb mixture. To remaining crumb mixture add baking powder, baking soda, cinnamon, and nutmeg. Mix well. Add buttermilk and egg; mix well. Spread batter into a greased 8x8x2-inch baking pan. Stir together reserved crumbs and walnuts; sprinkle atop batter. Bake in oven for 30-35 minutes or until a toothpick inserted near the center comes out clean. Serve warm. Note: if you have no buttermilk, you can make sour milk by measuring 1 T. white vinegar in one-cup measure, and filling remainder with milk. Let sit 5 minutes before using (for this recipe, 2/3 T. vinegar in 2/3 cup measure). Also good with blueberries. 1 or 1/2 cup should do it.