Sour Cream Coffeecake - Walter Stewart's Market

Ingredients

• 1/2 cup (8 tablespoons) butter
• 1 cup sugar
• 2 large eggs
• 2 cups King Arthur Unbleached All-Purpose Flour
• 1 teaspoon baking powder
• 1/4 teaspoon baking soda
• 1/2 teaspoon salt
• 1 cup sour cream or yogurt
• 1/2 cup sugar
• 2 teaspoons ground cinnamon
• 2 teaspoons vanilla extract
• 1/2 cup chopped walnuts or pecans, optional