Sour Cream Apple Coffee Cake - Lakewinds Food Co-op

Ingredients

• 5 egg yolks
• ⅔ cup sour cream, <em>divided</em>
• 1 ½ teaspoons vanilla
• 2 cups flour
• 1 cup sugar
• ½ teaspoon baking powder
• ½ teaspoon baking soda
• ¼ teaspoon salt
• ¾ cup butter, <em>at room temperature</em>
• 1 apple, <em>peeled, cored, thinly sliced </em>
• ⅓ cup brown sugar
• 2 Tablespoons sugar
• 1 cup pecans
• 1 ½ teaspoons cinnamon
• ½ cup flour, <em>sifted</em>
• 4 Tablespoons unsalted butter
• ½ teaspoon vanilla