Preheat the oven to 350°F. Spread chopped pecans on a sheet pan in a single layer. Toast in the preheat oven for 6-8 minutes until light golden brown. Set aside to cool.
In a medium bowl use a whisk to sift together flour, baking soda, baking powder and salt. Set aside.
In a large bowl, use an electric mixer on medium-high speed to cream the butter and dark brown sugar together until smooth, about 1-2 minutes.
To the bowl add the egg. Beat on high speed for another 30 seconds. Scrape down the bowl on sides and bottom. Add maple syrup, maple extract and vanilla extract Beat on high speed until well combined.
Lower the speed of the mixer and begin to add the sifted flour mixture to the wet ingredients, mix on low until combined. Stir in 3/4 cup of chopped pecans by hand.
Cover the bowl with plastic wrap and chill in the refrigerator for a minimum of 1-2 hours.
Bake: Preheat oven to 350°F (177°C). Line two sheet pans with parchment paper. Set aside.
Use a 1 ½ tablespoon cookie scoop to scoop out balls of cookie dough. Place dough balls in mounds on the cookie sheet, leaving 2-inches between each cookie.
Bake for 12-13 minutes or until lightly browned at the edges and soft in the center. Cool on the pan for 2 minutes then remove to a wire rack to cool completely.
Glaze: In a small saucepan over low heat, melt butter and syrup together, whisking occasionally. When butter has melted, remove from heat and add confectioners’ sugar, stirring until combined and smooth.
Drizzle glaze over cookies and sprinkle the tops with the remaining pecans.
Let stand until the glaze is set.