CaroleKnits posted her mother’s recipe for Sour Cream Coffee Cake. It’s a bit hard to find in her archives, so I’ll repost it here:
Sour Cream Coffee Cake
1 cup sour cream
1/2 cup butter
1 cup sugar
2 cups flour
1/2 tsp baking soda
1 tsp baking powder
1/4 tsp salt
1 tsp vanilla
Sift together flour, baking soda, baking powder and salt. Cream butter and sugar. Add eggs, vanilla and sour cream to butter and sugar then add sifted dry ingredients.
Prepare nut topping as follows:
1/2 cup chopped nuts
2 tsp cinnamon
1/4 cup sugar
Pour 1/2 batter into greased tube pan and sprinkle 1/2 nut mixture on top. Add remaining batter and top with remaining nut mixture. Bake at 350º for 45 minutes.
I made it last night, and it is truly an amazing cake. Instead of the nuts/sugar/cinnamon filling, I spread some boysenberry jam in the middle. Also, I don’t have a tube pan so I used a loaf pan and increased the baking time by ten minutes, which wasn’t quite enough — the top center was still kind of gooey, but 90% of the cake was perfect :) It’s easy to make, too, and doesn’t require any unusual ingredients, so as long as I keep sour cream handy I can make it any time. Ohhhh yes.
edit: the second time I made it, I added 1/4 cup cocoa powder and skipped the filling. YUM!