Lay pecans on a sheet pan in a single layer and toast in the oven for 5-7 minutes, until fragrant. Remove and set aside to cool.
Combine flour, salt and baking powder in a medium bowl. Whisk to combine, then set aside.
In the bowl of a stand mixer, or a large mixing bowl, beat melted butter, brown sugar and granulated sugar together. Then add eggs, one at a time. Beat until thoroughly combined.
Add maple extract and maple syrup. Continue mixing for 3 - 4 minutes, then add dry ingredients.
Mix until barely combined, then add toasted pecans and mix until nuts are incorporated.
On a parchment or silicone mat lined sheet pan, use damp hands to form 2 equal loaves of dough roughly 3" wide by 3/4" thick. Sprinkle 1 tbsp. raw sugar over each log of dough.
Bake for 22-24 minutes. Remove from oven and let cool for 15 - 20 minutes. Slice logs into approximately 1/2" slices and lay them on their sides.
Reduce heat to 300°F and bake for an additional 18 - 20 minutes. *SEE NOTE
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Notes
If biscotti isn't crunchy enough after 2nd bake, turn oven off and prop the door open with the handle of a wooden spoon (or something around a 1/2" thick). Let the biscotti continue to dry out in the warm oven for an additional 20 minutes.