Chop chives or scallions and set aside. Melt 2 Tbsp butter in a small dish and set aside.
In a medium bowl, combine salt, pepper, baking powder, baking soda, sugar, and flour, and whisk together until evenly combined.
Cut remaining 10 Tbsp. chilled butter into approx. ½” pieces. Add to dry ingredients and use hands to work butter into the dry ingredients, smashing and flattening the butter until broken up into pea-sized bits.
Add chives or scallions and mix. Make a well in the mixture and add sour cream. Mix with a fork until dough just comes together.
Turn dough out onto a lightly floured surface and knead twice until it comes together. Pat into 8” x 4” rectangle, approx. 1” thick.
Working from the short side, fold into thirds and press down to reform into another 8” x 4” rectangle. Repeat for a total of two times.
Use a bench scraper and cut into 8 biscuits. Brush with melted butter.
Sprinkle with sea salt and bake 18-20 minutes or until golden.