Preheat & Prep: Preheat oven to 350°F (175°C). Line a baking sheet with parchment paper.
Mix Dry Ingredients: In a large bowl, whisk together flour, brown sugar, baking powder, and salt.
Cut in Butter: Add grated cold butter and gently toss to coat. Use fingertips or a pastry cutter to mix until the texture resembles coarse crumbs.
Add Wet Ingredients: In a separate bowl, whisk together egg, sourdough discard, heavy cream, and vanilla. Pour into dry ingredients and gently mix until just combined. Fold in chopped pecans.After stirring, I like to flip the bowl of ingredients onto the counter and use my hands to combine everything. The warmth of your hands, combined with the butter, helps meld everything together. Fold for Flakiness: Turn dough onto a lightly floured surface and fold it over itself 2–3 times to create buttery, flaky layers. I will flatten out the dough (about an inch or two thick) and fold it over itself a few times.
Shape & Chill: Pat the dough into a 1-inch thick, 8-inch wide disc. Wrap the disc in plastic wrap and chill in the fridge for 20–30 minutes to firm up before cutting.
Cut & Bake: Slice the chilled disc into 8 wedges, slightly separate them, then brush the top of each one with heavy cream. Bake on the parchment-lined baking sheet for 25–27 minutes, or until golden brown. Cool slightly before glazing.
Make the Glaze: In a small bowl, whisk together powdered sugar, maple syrup, heavy cream, and vanilla until smooth. Drizzle over cooled scones. Sprinkle some chopped pecans over the scones.