Step 1
Place racks in higher and decrease thirds of oven; preheat to 350°. Toast 1 cup (100 g) coarsely chopped pecans or walnuts on a rimmed baking sheet, tossing midway by means of, till barely darkened in coloration and aromatic, 6–8 minutes. Switch to a plate and let cool.
Step 2
In the meantime, finely grind ¾ cup (75 g) old school oats in a blender, then sift by means of a fine-mesh sieve right into a small bowl; discard items left in sieve. You must have ½ cup (63 g) oat flour. Combine 1 cup (packed; 200 g) darkish brown sugar, ½ cup (1 stick) unsalted butter, melted, barely cooled, 2 tsp. vanilla bean paste or vanilla extract, 1½ tsp. Diamond Crystal or 1 tsp. Morton kosher salt, and 1 tsp. floor cinnamon in a big bowl till mixed. Whisk in 1 giant egg, then add ¾ tsp. baking soda, ½ tsp. xanthan gum, and oat flour and whisk vigorously 1 minute.
Step 3
Add pecans, 3½ oz. (100 g) semisweet chocolate, coarsely chopped (about ½ cup), 1 cup (160 g) dried tart cherries, and remaining 1½ cups (150 g) old school oats and fold into batter with a big rubber spatula till evenly distributed. Cowl bowl with a plate or plastic wrap and let dough sit at room temperature 1 hour to hydrate oat flour.
Step 4
Utilizing a #16 cookie scoop or ¼-cup measuring cup, portion out dough and divide between 2 parchment-lined baking sheets, spacing about 2″ aside (cookies will unfold as they bake; it’s best to have about 7 cookies per sheet). Press down on cookies gently to flatten barely, then frivolously sprinkle with flaky sea salt if desired.
Step 5
Bake cookies, rotating baking sheets prime to backside and entrance to again midway by means of, till edges are golden brown (facilities will nonetheless look underbaked), 10–13 minutes. Take away baking sheets from oven. For extra completely formed cookies (no obligation!), working separately, place a glass or spherical cutter with a diameter bigger than the cookies over or round them and scoot forwards and backwards and in a round movement to push edges clean, making a neat circle. Let cookies cool on baking sheets 10 minutes, then switch to wire racks and let cool utterly (heat cookies shall be fragile however will agency as they cool).
Do Forward: Cookies might be baked 1 day forward. Retailer hermetic at room temperature.
