Preheat the oven to 350°F (175°C). Line a baking sheet with parchment paper.
Sift flour, baking powder, and salt together in a bowl.
In a large bowl, beat butter and white sugar until smooth using an electric mixer. Beat in one egg until blended, then the other egg, maple syrup, maple extract, and the sifted flour mixture alternately until dough forms. Fold in chopped walnuts.
Divide the dough into two portions. Shape each portion into a log as long as the baking sheet; place them on the prepared sheet. Flatten each log into a rectangle 3-inch wide and 1-inch tall.
Bake until lightly browned at the bottom and slightly cracked on top, approximately 30 minutes. Cool for 15 minutes.
Slice logs diagonally into 0.5-inch thick slices; arrange them on their sides on the baking sheet.
Bake biscotti in the preheated oven until lightly browned and crisp, about 8 minutes. Allow to cool for a few minutes.
In a bowl, mix 1/4 cup maple syrup, 1 tablespoon melted butter, and confectioners' sugar until smooth. Drizzle the maple glaze over warm biscotti.
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