cinnamon swirl cake

Ingredients

• 1 box yellow cake mix
• 1 box vanilla instant pudding
• 3/4 cup cooking oil
• 3/4 cup water
• 4 - eggs adding 1 at a time
• 1 teaspoon vanilla extract
• 1 teaspoon butter extract
• 1/2 package sour cream
• FILLING
• 1/2 cup sugar
• 2 teaspoons cinnamon, ground
• 1/2 cup chopped walnuts
• GLAZE
• 1 cup powdered sugar
• 1 teaspoon vanilla extract
• 3 tablespoons milk
• 1/2 teaspoon butter extract