Preheat oven to 425° (F). Line a large baking sheet with parchment paper and set aside.
Place oatmeal in a food processor and pulse until coarse flour is created. In a large bowl add oatmeal flour, all-purpose flour, brown sugar, baking powder, baking soda, salt, nutmeg, and cinnamon. Mix until well combined.
Add cold butter. Cut in with a pastry blender until a coarse sand texture.
Add heavy cream, pumpkin, and egg. Mix with silicone spatula, or wooden spoon, until dough begins to form. Note not all the flour will mix in during stirring.
Place dough, and any remaining flour mixture in the bowl, onto a lightly floured surface. Gently knead into a ball until all the remaining flour mixture has been incorporated. Being careful to not over work the dough.
Flatten dough into a disc about 12 inches in diameter and 1 inch thick. Place disc on top of parchment paper on prepared baking sheet. Using a sharp knife cut into 8 large triangles being careful not to cut through parchment paper. Do not separate scones, they should remain together during baking. This helps them hold their shape.
In a small bowl combine ½ cup sugar and 1 teaspoon of cinnamon. Stir until mixed. Sprinkle cinnamon sugar on top of each scone. Sprinkle pecans on top of scones and lightly press into the top of each scone.
Place scones in preheated oven. Bake 20–25 minutes until center of each scone is set and no longer doughy.
Remove scones from oven and place on wire rack to cool. While scones are cooling in a small bowl combine glaze ingredients. Powder sugar, pure maple syrup, milk, maple extract (optional), and a pinch of salt. Stir until combined. Separate each individual scone and drizzle Maple glaze over the top of each scone. Wait 5 minutes for glaze to set and serve!