Preheat your oven to 350°F (175°C) and prepare a muffin tin by greasing or lining it.

Cream together softened butter, brown sugar, and granulated sugar for 2-3 minutes until light and fluffy.

Incorporate eggs one at a time and then stir in vanilla extract.

In a separate bowl, whisk flour, baking soda, and salt. Gradually mix this into the wet ingredients until combined.

Fold in chopped pecans and chocolate chips until evenly distributed.

Spoon the dough into the muffin tin, filling each cup three-quarters full. Bake for 12-15 minutes until edges are golden.

Cool in the pan for 5 minutes before transferring to a wire rack to cool completely.