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Preheat oven to 350 degrees F. Lightly coat a 9-inch cast-iron skillet with nonstick cooking spray. (See note below if you don't have a cast iron skillet.)
In a large bowl with an electric mixer, beat butter and 1 cup of the sugar together until combined and fluffy, about 2 minutes.
Add in the eggs, one at a time, beating well after each addition. Add in the vanilla.
Add in the flour, baking powder, and salt, beating just until combined, scraping down the sides of the bowl if necessary.
Add in the sour cream and combine.
Fold in the blackberries.
Spread the batter into the prepared skillet. Sprinkle evenly with the remaining 2 tablespoons sugar.
Bake until a tester inserted in the center comes out clean, about 40 minutes.
Let cool, serve, and enjoy!