2 tablespoonscinnamon sugar Maple syrup (optional)
Preheat oven to 400°F. Combine sausage, cheese and apple in large bowl. Stir in walnuts, if desired.
Press or roll out each biscuit on lightly floured surface to a 5-inch circle. Spoon ¼ cup sausage mixture onto center of each biscuit. Beat egg with water; brush onto edges of biscuits. Fold in half; press edges together with fork to seal.
Place on baking sheet sprayed with cooking spray. Brush tops with remaining egg wash; sprinkle with cinnamon sugar.
Bake 10-12 minutes or until golden brown. Serve warm with syrup, if desired.