Buttercream Coffee Cake - cooking recipe

Ingredients

Coffee Cake
1/3 cup butter
1/2 cup butter
2 1/4 cups sifted flour
1/3 cup brown sugar
1 teaspoon cinnamon
1/2 cup chopped walnuts
1/2 teaspoon baking powder
3/4 teaspoon baking soda
1/2 teaspoon salt
2/3 cup sugar
2 eggs
1 cup sour cream
1 teaspoon vanilla
Buttercream filling
1/4 cup flour
1/2 teaspoon salt
1 cup milk
2/3 cup butter
1 cup sugar
1 teaspoon vanilla

Preparation

Cut 1/3 cup butter into 3/4 cup flour, brown sugar and cinnamon till fine.
Stir in walnuts.
Sift 1 1/2 cups flour with baking powder, soda and salt.
Cream 1/2 cup butter in bowl; add sugar and cream till light.
Add eggs one at time, beating well; blend in vanilla.
Add dry ingredients alternately wit sour cream to creamed mixture.
Spread in 9x9-inch floured and greased pan. Sprinkle with walnut mixture. Bake at 325 for 50 minutes.
When cool, split horizontally and fill with filling. Store in refrigerator.
For the Buttercream filling: Combine flour, salt salt and milk in saucepan. Cook over low heat till thick, stirring constantly; cool.
Cream butter and sugar. Add flour mixture and beat till fluffy.