Coffee Cake Exceptionale

Ingredients

• CAKE
• 3/4 cup butter or 3/4 cup margarine, softened
• 1 1/2 cups sugar
• 3 eggs
• 1 1/2 teaspoons vanilla
• 3 cups flour (see note)
• 1 1/2 teaspoons baking powder
• 1 1/2 teaspoons baking soda
• 1/4 teaspoon salt
• 1 1/2 cups sour cream
• FILLING
• 1/2 cup brown sugar, packed
• 1/2 cup finely chopped nuts
• 1 1/2 teaspoons cinnamon