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In a medium saucepan, melt the butter, chocolate chips and chopped chocolate, stirring frequently, over medium heat. Let cool for 15 minutes.
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In a medium bowl, sift together the flour, cocoa powder, baking powder and salt.
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Using an electric mixer, beat the sugar, eggs and vanilla at low speed until smooth, 2 minutes. Mix in the cooled chocolate mixture just until blended.
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Add the flour mixture in 3 batches, mixing on low speed until just combined.
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Fold in butterscotch chips.
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Refrigerate the dough for at least 1 hour.
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Preheat oven to 325 degrees F.
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Spray a baking dish with non-stick spray.
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Pour batter into dish.
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Bake for 30 minutes. (Top should be firm but a toothpick should come out clean).
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Serve and enjoy!