Combine oats, crisped rice, coconut, brown sugar, oat flour, cocoa powder, and salt. Mix well.
Combine coconut oil, honey and vanilla. Whisk well. Add to dry ingredients and mix well. (Stir. Stir some more. Keep stirring!)
Line a large cooke sheet with parchment paper. Pour granola bar mixture onto the lined cookie sheet. Press mixture out into a large, uniform rectangle, about 9" x 13" (which will be smaller than the pan, you do not push the granola all the way to the edges of the pan). It is easiest to form the rectangle if your hands are wet.
Bake for 15 minutes, rotate pan and bake for 14-15 more minutes.
Cool completely before cutting. Cut into 24 bars, 8 rows x 3 columns.
Notes
The coconut oil can be solid or liquid - whatever it happens to be sitting in your cupboard is fine! If you do not need these to be gluten free, regular all-purpose flour can be substituted for oat flour with the same measurement.
Recipe by This Week for Dinner at https://thisweekfordinner.com/gluten-free-homemade-chocolate-granola-bars/