Popcorn Cookies
["1 c. freshly popped corn (unsalted)", "1 c. chopped walnuts", "3 egg whites", "1/2 tsp. baking powder", "1/8 tsp. salt (optional)", "1/2 c. sugar"]
["Place popcorn in a food processor or blender and process until moderately fine.", "Combine with nuts and set aside."]
["freshly popped corn", "walnuts", "egg whites", "baking powder", "salt", "sugar"]