In the bowl of a stand mixer, combine flour, oats, sugar, salt & butter until crumbly. Set aside 1½ cups for topping. Press remaining crumb mixture into an un-greased 13x9" baking dish.
Bake at 350˚F for 15-18 minutes or until edges begin to brown.
In a small bowl, combine pie filling & extract; carefully spread over crust. Alternately sprinkle with reserved crumb mixture & chocolate chips, leaving little windows of cherry pie filling. (So you can see the cherries, the chocolate chips & the crumbs in every bar.)
Return to oven & bake 20-25 minutes longer or until edges & topping are lightly browned. Allow to cool completely. Cut into desired size bars.