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line two baking sheets with parchment paper and preheat oven to 350.
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sift flour, baking powder, and salt in medium bowl and set aside.
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in large bowl, mix together buttermilk, brown sugar, and vanilla. add eggs and mix until blended.
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on low speed, add the flour mixture, mixing until combined.
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melt the butterscotch chips and set aside.
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drop dough teaspoons about 3 inches apart onto prepared baking sheets. drizzle about 1/4 teaspoon of melted butterscotch over the top of each cookie and gently swirl with a toothpick or small sharp knife to marbelize it.
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bake the cookies one sheet at a time until the tops feel set and the edges are slightly browned, about 10 minutes.