Preheat the oven to 300°F and line a baking sheet with parchment paper.

In a large bowl, combine the oats, walnuts, coconut flakes, if using, cinnamon, and salt. Drizzle in the coconut oil and maple syrup and add the almond butter. Stir until combined. Scoop the granola onto the baking sheet and press the mixture into a 1-inch-thick oval. This will encourage clumping.

Bake for 15 minutes, rotate the pan halfway, and use a fork to gently break the granola apart just a bit. Bake for 15 minutes more, or until golden brown. Sprinkle with dried cranberries, if desired. Let cool for 15 minutes before serving.