Laurie Colwin's famous nutmeg cake. The technique is a little different. This is a rich cake top over a cookie base. If you don't know Laurie check this out. http://www.scils.rutgers.edu/--esmith/colwin.html
- Butter the sides only of a 10-inch springform pan.
- Preheat the oven to 350 degrees F.
- In a large mixing bowl, combine the butter, cut into 6-8 pieces, with the flour and dark brown sugar. Using a pastry blender, cut the butter into the flour and sugar until the mixture resembles fine meal.
- Measure out 2 1/2 cups of this mixture and spread it evenly in the bottom of the prepared pan. With your hand flat, firmly compress the mixture evenly into the bottom of the pan.
- Add the spices to the remaining dry ingredients.
- Mix well.
- In a small bowl stir the egg and yogurt together to mix well.
- With a wooden spoon, stir the wet mixture into the dry mixture.
- Sprinkle the baking soda over the surface of the batter and gently but thoroughly stir it inches.
- Spread this batter over the mixture that was pressed into the bottom of the pan.
- With a rubber spatula smooth the top of the batter.
- Scatter the walnuts on top.
- Bake in a preheated 350 oven for 50-55 minutes or until a toothpick comes out clean and the sides of the cake have shrunk slightly away from the pan.
- Cool in the pan, on a rack, for 5 minutes.
- Then slide a knife around the edge of the cake to be sure it's not stuck.
- Remove the sides of the pan and cool cake completely.