Preheat oven to 350°F. Line two baking sheets with parchment.
Whisk flour, baking powder, baking soda, salt, and nutmeg in a medium bowl.
Cream butter, granulated sugar, and brown sugar until pale and fluffy, about 2–3 minutes.
Beat in eggs and vanilla until smooth, scraping the bowl as needed.
Stir in dry ingredients in two batches, alternating with buttermilk. Mix just until combined.
Let the dough rest 5 minutes to hydrate. Scoop rounded tablespoons onto sheets, 2 inches apart.
Bake 10–12 minutes, until tops are set and edges just turn golden.
Cool 5 minutes on the sheet, then transfer cookies to a rack to finish cooling.
Notes
Variation: Whisk 1 cup powdered sugar with 1–2 tbsp buttermilk and a splash of vanilla for a quick glaze. Drizzle over cooled cookies and finish with a pinch of nutmeg.Storage: Keep in an airtight container at room temperature for 3–4 days, or freeze up to 2 months.This recipe is an original creation inspired by classic Amish Buttermilk Cookies flavors. All ingredient ratios and instructions are independently developed.