Preheat the oven to 350˚F. Mix baking soda and water together and set aside.
Use a stand mixer to combine the butter and shortening. Then cream in the brown sugar and granulated sugar for 2-3 minutes.
Add eggs and vanilla. Mix for 2-3 minutes.
Stir in the baking soda and water mixture.
Add the salt and then add the flour one cup at a time, mixing well after each addition.
Stir in white chocolate chips and chopped pecans.
Spread batter into a greased 9x13-inch pan.
Bake at 350° F for 20-25 minutes. Do not overbake.
Video
Notes
Be sure to make Maple Cream Sauce to put on top with a scoop of vanilla ice cream!Store the bars in an airtight container at room temperature for 3-4 days or in the freezer for 3-4 weeks.