Preheat oven to 400°.
Lightly spoon flour into dry measuring cups; level with a knife. Combine the flour, baking powder, baking soda, and salt in a large bowl; cut in butter with a pastry blender or 2 knives until mixture resembles coarse meal. Combine buttermilk and egg; stir in chives. Add buttermilk mixture to flour mixture, and stir just until moist.
Turn dough out onto a heavily floured surface; knead lightly 5 times. Roll dough to a 1/2-inch thickness; cut with a 2-inch biscuit cutter. Place dough rounds, 1 inch apart, on a baking sheet. Bake at 400° for 12 minutes or until golden. Serve warm or at room temperature.
Note: To maximize the number of biscuits, gather the dough scraps after cutting and gently reroll to a 1/2-inch thickness. A light hand with the dough will ensure tender biscuits.