Brown butter in a large saucepan or stock pot over medium heat until bubbly and amber-colored.
Remove from heat and add cinnamon, nutmeg, ginger, and fresh ginger and stir to combine. Then, add molasses and mix.
Once your butter mixture is lukewarm or cool to the touch, add your brown sugar, white sugar, and egg and mix until homogenous.
In a separate large bowl, sift together AP flour, bread flour, baking powder, and baking soda. After sifting, add your oats and sea salt.
Add your dry ingredients and chopped chocolate to your brown butter mixture and work together with a spatula or wooden spoon. You can use your hands if easier.
Portion dough into 7 large balls with an ice cream scoop and place on a baking sheet, covered.
Let dough balls rest in the fridge for at least 10-15 minutes before baking, ideally for 24 hours for best results, air-tight.
Preheat oven to 350°F and line a baking sheet with parchment paper.
Let the dough balls come to room temperature and flatten with your hands or a non-stick plate.
Bake for 12-15 minutes. Half-way through baking remove cookies from oven and bang the pan to help spread.
Remove cookies from oven and bang one more time to help flatten. Sprinkle with a touch of coarse sea salt and let cool for 10-20 minutes until firm.