Pre-heat oven to 350F & line a baking sheet with parchment paper.
Once the oven is preheated, toast the pecans on the baking sheet for 5 minutes. Then remove from the oven and set aside.
Mix dry ingredients together (flour, baking soda, baking powder, salt) & set aside.
In another bowl, mix together melted butter, sugar and brown sugar until combined. Then mix in egg, vanilla and maple syrup until smooth.
Pour flour mixture into wet mixture and mix until combined. Stir in 1/2 cup toasted pecans and mix to combine.
Scoop 1 1/2 - 2 tablespoonfuls of cookie batter per cookie into balls, placing them about 2 inches a part on a baking sheet (make sure to leave space between cookies as they will spread). Makes about 18-22 cookies so you will need to bake in batches.
Bake for 9-11 minutes until just browning on the edges. Remove from oven & let sit on pan for a few minutes before moving to cooling rack.
Once cookies cooled, make the glaze by mixing the melted butter, maple syrup & icing sugar and drizzle over cookies.