Preheat the oven to 350 degrees. Lightly butter and flour an 8X8 pan.

In a bowl, whisk together the melted butter and sugar. Add the egg and vanilla extract and whisk. Add the flour, baking soda, baking powder, and salt, mix it all together with a spoon. Add the butterscotch chips or other mix-ins.

Pour into the pan and spread evenly. Bake at 350 degrees for 20-25 minutes (I had to cook min for 30 min) or until a toothpick comes out clean. Allow to cool. Cut into squares and serve. Makes 9 blondies.