Heat the oven to 425°F (218°C). The hot oven helps the cold butter create steam quickly, which encourages a taller rise.
Whisk the flour, baking powder, baking soda, and salt in a large bowl, or pulse them together in a large food processor, then cut in the cold butter with a pastry cutter or by pulsing several times. Stop when the mixture looks crumbly and you can still spot small butter pieces throughout.
If you used a food processor, transfer the mixture to a large bowl, then make a well and add 1 cup (240ml/g) buttermilk with the honey. Fold gently with a large spoon or spatula until the dough starts clumping and still looks shaggy with a few dry and wet patches.
Turn the dough and loose crumbs onto a floured surface, then bring it together with well-floured hands and pat it into a 3/4-inch-thick rectangle. The dough will feel sticky as it comes together, so dust your hands and the surface as needed without kneading heavily.
Fold one side of the rectangle into the center, fold the other side over it, turn the dough 90 degrees, and flatten it again to 3/4 inch thick. This first letter fold starts building the layers that make the biscuits flaky instead of cakey.
Repeat the fold and turn, flattening the dough back into a 3/4-inch-thick rectangle each time, until you have folded it a total of three times and finished with a final 3/4-inch-thick rectangle. By the last fold, the dough should look more organized but still show buttery streaks and soft edges.
Cut the dough into 2.5- or 3-inch circles with a biscuit cutter, pressing straight down, then re-roll the scraps until all the dough is used. Avoid twisting the cutter, because sealed edges make it harder for the biscuits to rise fully.
Set the biscuits in a 10-inch cast iron skillet or close together on a parchment paper-lined baking sheet so they are touching, then brush the tops with the remaining buttermilk. Placing them close together helps them support one another as they rise.
Bake for 18 to 20 minutes. They are ready when the tops are golden brown and the biscuits look tall and set.
Whisk the melted butter and honey together if using the topping, then brush it over the warm biscuits and serve. The finish adds shine, extra buttery flavor, and a soft sweet note on top.