Step 1Heat the oven to 350 degrees.
Step 2In a large bowl, toss together the oats, ground flax, pecans, almonds and coconut. Stir in the salt, cinnamon, nutmeg and brown sugar. Pour over the maple syrup and oil, mixing well to combine. Add dried fruit, cacao nibs or chocolate chips, if desired.
Step 3Grease two 8- or 9-inch-square baking pans and line the bottoms with parchment paper, allowing the paper to come up 2 sides of each pan. Grease the paper. Divide and press the mixture into the pans to form a firm, even layer. Bake until the the mixture is toasted to a nice golden brown, and the top feels somewhat firm, about 45 minutes; the bars will continue to firm up as they cool.
Step 4Remove and cool to room temperature, then refrigerate for at least 2 hours before cutting into bars.