Ingredients:
2 cups - all purpose flour
1/2 tsp - salt
1/2 cup - unsweetened cocoa powder
2 tsp - baking powder
1/2 tsp - ground cinnamon
1 tsp - instant coffee granules
1/2 cup - butter, softened
3/4 cup - white sugar
2 - eggs
1 tsp - vanilla extract
1/2 cup - miniature semisweet chocolate chips
1/2 cup - chopped walnuts
1 - egg yolk
1 tbsp - water