In a small saucepan, melt one stick of butter over medium heat.Melt the butter and then cook it, swirling occasionally, until it is light brown in color.it will smell nutty soon and it should take about 5 minutes.
Transfer the browned butter to a large bowl and the bits of browned butter left behind.
Melt the 1/2 stick of butter and pour it into the browned butter mixture.
Using a whisk, add the brown sugar and combine.
Add in the egg and the pure vanilla extract, whisk.
Combine the flour and baking soda in a small bowl. Then, add the dry ingredients to the mixture.Stir until you no longer see any large lumps.
Fold in pecans and chocolate chips. Be careful not to overmix.
Chill the butter pecan cookie dough for 30 minutes in the refrigerator.
Heat the oven to 375 degrees.
Use a 2 tablespoon cookie scoop to form cookie dough balls. Place the cookies 2 inches apart to leave room for them to spread as they bake. Lightly press down each cookie so they are about 1/2 inch thick. Sprinkle with flaky salt.
Bake the cookies for 11-14 minutes or until the edges have set. Remove the pan from the oven and lightly tap it on the stove or counter. This will deflate them so they finish flattening out.
Cool the cookies on the cookie sheet for 5 minutes, then remove and place on a wire rack.