INGREDIENTS
•
Cake
•
Nonstick vegetable oil spray
•
2 large egg whites (1/4 cup)
•
1/3 cup (packed) golden brown sugar
•
Pinch of salt
•
1-1/2 cups coarsely chopped walnuts
•
1-1/4 cups mini semisweet chocolate chips, divided
•
2 cups cake flour
•
1/2 teaspoon salt
•
1/4 teaspoon baking powder
•
1/4 teaspoon baking soda
•
1 cup plus 2 Tablespoons sugar
•
1/2 cup unsalted butter, room temperature
•
3 large eggs
•
3/4 cup sour cream
•
Topping
•
3/4 cup powdered sugar
•
2 Tablespoons sour cream
•
Milk