1
Heat oven to 300°F. Line 9" x 9" baking pan with foil. Oil and flour the foil. (An 8" x 8" pan can be used. Just bake 5 to 10 additional minutes.)
2
Mix cereal, nuts, fruit, flour, and an extra, if using, in large bowl.
3
Combine sugar and salt in small bowl. Whisk in egg whites and extract, if using. Pour mixture into dry ingredients and stir to combine.
4
Pat into the prepared pan with moist hands or plastic wrap.
5
Bake until bars are dry to the touch, 45 minutes to 1 hour, depending on ingredients used. Cool completely.
