Walnut Espresso Coffee Cake - Diamond Nuts

Ingredients

• 2 cups flour
• 1 1/2tsp baking powder
• 1/2tsp baking soda
• 1/2tsp salt
• 1 cup sugar
• 1 cup sour cream
• 1 stick butter
• 1 tbsp espresso powder
• 1/4cup warm water
• 1 cup brown sugar
• 1/2cup melted butter
• 1/2cup Diamond of California ® Chopped Walnuts
• 1/4cup flour
• 1tsp espresso powder
• 3 tbsp warm water
• 1 cup powdered sugar