• Preheat oven to 350°.
• Lightly grease and flour 10" tube pan. (I used a two piece tube pan and it's so helpful in releasing this cake.) You want an extra large tube pan as this is a big recipe!

Cinnamon Filling

• In small bowl combine 1/2 cup brown sugar, 2 1/2 teaspoons ground cinnamon and 1/2 teaspoon unsweetened cocoa powder.
• Set aside.

Streusel Topping

• In small bowl combine 3/4 cup sugar, 1/4 teaspoon salt, 3/4 cup all purpose flour and 1 1/2 teaspoons cinnamon.
• Stir in melted butter. Set aside.

Coffee Cake

• Cream 3/4 cup butter and white sugar together in mixing bowl.
• Stir in eggs, blending well, then add sour cream and vanilla extract.
• Separately in small bowl, stir together flour, baking powder and salt.
• Add flour mixture to wet ingredients until just combined.
• Stir in apples.
• Place half batter in prepared pan.
• Sprinkle with cinnamon filling.
• Pour remaining batter on top.
• Sprinkle cinnamon streusel topping on top.
• Bake for 60 - 75 minutes or until cake tester comes out clean. (Your cake may need even longer depending on the moisture content of the apples.)
• Cool.
• Loosen all accessible edges with sharp knife.
• Carefully lift out of cake pan and place on cake platter.
• (I used two hard metal spatulas underneath the bottom of the cake to lift it out of the the pan. )