Make the doughnuts: Whisk together the flour, baking powder, salt and cinnamon in a small bowl and set aside. In a large bowl, combine the butter, sugar, honey, egg and vanilla extract. Add the buttermilk and mix until combined. Add the dry ingredients and mix until just combined – make sure not to overmix. Transfer the batter to a piping bag. In a separate bowl, combine the ground cinnamon, brown sugar and crushed pecans.