Preheat oven to 350 degrees. Lightly grease a 9” x 9” square pan. In a medium bowl, whisk together cornstarch and sugar (or honey, if using). Stir in sliced fruit and pour into greased pan, packing fruit flat. Measure 1 ½ c. of the quick oats into a blender or food processor and process until ground into flour. In the same bowl you used for the fruit, combine the oat flour with the remaining ingredients until it appears gravely (clean hands work great for this!). Sprinkle crisp topping evenly over fruit in pan and bake for 30-35 minutes, until top is golden and crispy, and fruit is jammy and oozing out around the edges of the pan. Serve warm or cooled.