Pre-heat oven to 350° F.
Add baking blend, baking soda, baking powder, and salt into a bowl, then whisk.
Add in nuts and chocolate chips and mix together.
Melt butter in a medium saucepan on stovetop.
After butter has melted, remove saucepan from heat, and stir sweetener into the melted butter, and allow to cool.
Add egg and vanilla into the cooled, sweetened melted butter mixture ,in saucepan, and stir.
Gradually add the dry ingredients to the butter mixture, mixing well.
Pour into greased 9x9 square pan (or brownie pan)
Bake for 20 to 25 minutes.
Allow to cool and cut into 3x3 inch bars.