Preheat your oven to 350°F (175°C). Gather all your ingredients and prepare mixing bowls.

Cream together 1 cup unsalted butter, ½ cup granulated sugar, and ¾ cup dark brown sugar in a large mixing bowl until light and fluffy.

Add in 1 large egg and 1 teaspoon vanilla extract, and mix until fully combined and smooth.

In a separate bowl, whisk together 2 ¼ cups of all-purpose flour, 1 teaspoon kosher salt, 1 teaspoon baking soda, and ½ teaspoon baking powder.

Gradually add the dry ingredients to the wet mixture, stirring gently until just combined.

Fold in 1 cup dark chocolate and ½ cup chopped pecans (if desired) until evenly distributed.

Chill the dough in the refrigerator for about 20-30 minutes to prevent spreading.

Scoop heaping tablespoons of dough onto prepared baking sheets, and bake for 10-12 minutes until edges are golden brown.

Remove from oven and cool on baking sheets for about 5 minutes before transferring to a wire rack.