Preheat oven to 350 degrees.
Combine flour, salt, baking powder and baking soda and sift twice.
Add 1/2 cup chopped walnuts, mix well and set aside.
Melt butter, when melted add brown sugar and mix well.
Then add egg and vanilla and mix well.
Add flour mixture slowly, mixing well.
Add white chocolate chips.
Spread in a greased (with butter) 9 inch square pan.
Bake 20 to 25 minutes until done (when a wooden tooth pick comes out clean).
While baking, melt 1/2 cup of butter and the cream cheese in a pan with maple syrup, stir in brown sugar until it is dissolved. Once the brownies are done serve brownies topped with vanilla ice cream, drenched in maple butter syrup and sprinkled with walnuts.
