2 tablespoons snipped chives, plus more for garnish
Preheat the oven to 425°. In a bowl, whisk the flours, baking powder, baking soda and salt. Using a pastry blender, cut in the butter until the mixture resembles coarse meal. Stir in the 3/4 cup of buttermilk just until a raggy dough forms.
Turn the dough out onto a work surface and knead just until it comes together. Roll out the dough 1/2 inch thick and stamp out four 3-inch rounds. Gather the scraps and reroll; stamp out 2 more rounds. Place the biscuits on a baking sheet and brush the tops with buttermilk. Bake for 20 minutes, until the biscuits are risen.
In a skillet, heat the oil. Add the turkey; cook over moderately high heat, breaking it up, until browned, 5 minutes. Stir in the sage, chipotles, 1/2 teaspoon each of salt and pepper, and the flour; cook for 1 minute. Add the milk and simmer, stirring, until thick, 5 minutes. Add the 2 tablespoons of chives.
Split the biscuits, top with gravy, garnish with chives and serve.