Preheat oven to 180 ºC.
Grease and line a 23 cm square cake pan.
Cream the butter and sugar together.
Add the eggs and vanilla. Beat well.
Sift dry ingredients together and add alternatively to batter with soured cream.
Mix pecan nuts, sugar and cinnamon together.
Pour half the batter into the prepared cake pan.
Sprinkle with half the cinnamon mixture, then pour remaining batter over.
Sprinkle with the rest of the cinnamon mixture.
Bake for 30 to 40 minutes.
Allow to cool, then cut into squares to serve.
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