Preheat oven to 350°F/180°C and line two baking trays with parchment paper. Set aside.
Melt the butter over low heat. Then, in a large bowl, whisk in the slightly cooled melted butter, brown sugar, and white sugar for one minute until combined.
1/2 cup butter, 1/2 cup dark brown sugar, 1/3 cup white sugar
Add in egg and vanilla and continue whisking.
1 egg, 1 tbsp vanilla
Fold in the flour, baking soda, baking powder, cinnamon, and salt using a spatula until just combined.
1 1/2 cups all-purpose flour, 1 tsp cinnamon, 1/2 tsp baking soda, 1/2 tsp baking powder, 1/4 tsp salt
Mix in the butterscotch chips, chocolate chips, and chopped pecans.
1/2 cup semi-sweet chocolate chips, 1/2 cup butterscotch chips, 1/4 cup chopped pecans
Scoop 6 cookie dough balls on each tray at a time, I used a large cookie scooper about 3 tbsp in size. Bake for 12-15 minutes or until the edges are a light golden brown.
Top off with additional chocolate and pecans if desired. Sprinkle some flakey sea salt on each cookie (optional, but highly encouraged). Cool the cookies on a cooling rack and enjoy!