Make the veggie stuffing base: Pulse celery, carrot, onion, thyme, and sage in a food processor. Heat oil in a skillet, add veggies and seasonings. Cook for 15 minutes until tender. Let cool.
Bake the stuffing biscuits: Preheat oven to 450°F. Pulse dry ingredients in processor, add butter until crumbly. Stir in buttermilk and 1/3 of the veggie mixture. Divide into muffin tins and bake for 15 minutes.
Cook the turkey patties: Mix turkey with remaining veggie mixture. Form 24 small patties and bake on a sheet at 450°F for 15 minutes (165°F internal temp).
Assemble the sliders: Slice biscuits, add a turkey patty, a dollop of mayo, and cranberry preserves. Serve warm.
Notes
Nutrition per serving: Calories: 330, Total Carbs: 27g, Net Carbs: 26g, Fats: 18g, Protein: 15g.