Preheat the oven to 350° F. In a large bowl, stir together the melted butter, brown sugar, egg, and vanilla. Add the flour, baking powder, baking soda, and salt. Mix well. Stir in the butterscotch chips. Pour into a greased 8x8-inch pan and bake for 18 to 20 minutes, or until just set. Cool completely before cutting.
* If nutritional values are provided, they are an estimate and will vary depending on the brands used. The values do not include optional ingredients or when ingredients are added to taste.
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