Preheat oven to 375°F. Line baking sheet with silicon liner or parchment paper.
In a large bowl, combine flour, salt, cinnamon, and baking powder; whisk to mix thoroughly. Set aside.
In the workbowl of a stand mixer, combine the butter and sugars at medium speed until light and fluffy, approx 2 minutes. Scrape down bowl and beater.
Add in the vanilla and bourbon and mix until well combined.
Add in the eggs, one at a time, mixing 15 seconds after each addition. Scrape down bowl and mix again briefly to combine thoroughly.
Take bowl off mixer and fold flour mixture into egg mixture, combining well with a wooden spoon or stiff spatula. Fold in the pecans and chocolate chips/chunks.
Using a 1 Tbsp scoop or a spoon, make walnut sized mounds of dough on baking sheet, spacing cookies at least 2" apart (I get 20 on a half-sheet sized pan). If desired, press a pecan half on top of each cookie.
Bake one sheet at a time, approximately 8-10 minutes, rotating half way through baking time. Cookies will be soft in the middle with lightly browned edges.
Immediately sprinkle lightly with fleur de sel. Let cool on sheet pan 10 minutes before transferring to a cooling rack.