Apple Crumb Coffeecake

• 9 round cake with vegetable spray (pan)
• 1 egg
• 5/8 apple mixture over batter
• 5/8 batter over bottom (pan)
• 1,900 ml saucepan
• 325 gr flour
• 250 gr sugar
• 250 gr sugar divided
• 190 gr apples (peeled)
• 180 ml buttermilk