Preheat the oven to 350°F (175°C) and grease a baking pan.

In a mixing bowl, whisk together the flour, baking soda, and salt.

In another bowl, cream together the softened butter, brown sugar, and granulated sugar until smooth.

Beat in the egg and vanilla extract until well combined.

Gradually add the dry ingredients to the wet ingredients, mixing until just combined.

Fold in the chocolate chips and nuts if using.

Spread the batter evenly in the prepared baking pan.

Bake in the preheated oven for 20-25 minutes, or until golden brown.

Allow to cool before cutting into bars.