Instructions: Cream the butter and blend in the sugar. Add the eggs one at a time and beat well after each addition. Blend in sour cream. Sift the flour with baking powder, and add to first mixture in 3 or 4 parts. Add vanilla; blend well. Bake at 350 degrees for 1 hour and 25 minutes or until tests done. Remove from oven, let stand 5 minutes, invert and cool. When cool, wrap in saran wrap or foil and leave for 24 hours at room temperature.

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