Preheat the oven to 325 degrees.In a large bowl, combine the oats, almonds, pecans, flour, cinnamon, salt, and sugar if using. Stir to combine.Whisk the oil and the honey together. Pour over the oats mixture and until the whole mixture is moistened. Pour into a large jelly roll pan in a single layer, which will be thick - that's okay because if you spread it out too much, it will bake too quickly and get crunchy and hard. No good.Bake for 20 minutes, stir once, bake for 10 more minutes, stir once, and add the coconut flakes on top. Bake for a final 5 minutes (the coconut will get nice and brown) and remove from the oven. DON'T STIR right away! Let it just sit and mellow out on the pan - this helps it cluster up a little bit.