Heat oven to 350 degrees F. Combine flour, salt and baking soda in medium bowl, stir in oats. Combine butter, brown sugar and sugar in large bowl. Beat at medium speed, scraping bowl often. Add eggs and vanilla, beat until well mixed. Reduce speed to low; add flour mixture. beat until well mixed. Stir in cinnamon, chips and apple. Spread batter into greased 9x13 inch baking pan. Bake for 33-38 minutes or until toothpick inserted in center comes out clean. Cool completely. Combine all frosting ingredients in small bowl. Beat at low speed, scraping bowl often, until creamy. Spread over cooled bars. Sprinkle with cinnamon, if desired.
By Robin from Washington, IA
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