A few hours before, remove the butter from the fridge and allow to soften.
Preheat the oven to 375ºF. (If you have not softened the butter yet, you can wrap in a towel and place near the oven, so it warms some. Then, chop into small pieces before adding to the mixer.)
In the stand mixer with the spatula-paddle, add the 226g softened butter and the 175g each of the sugars. Mix well on a medium-high speed for a few minutes, to get plenty of air into the butter.
In a separate bowl, mix together the 270g flour, ½ tsp baking soda and 1 tsp salt. Add to the stand mixer and mix on low until just combined. (Don’t develop that gluten.)
Then, add the 1½ tsp vanilla, ½ tsp cinnamon, 175g chocolate and 125g pecans. Mix on low until just combined.
On baking sheet(s) lined with aluminum foil, place 1 tbsp of dough about 2” apart. Bake for 10-12 minutes. Add a touch of flake salt as soon as they come out of the oven. Leave on the baking sheet for a few minutes, and then transfer to a cooling rack.