Preheat and Prepare: Preheat your oven to 350°F (175°C). Line a baking sheet with parchment paper.
Cream Butter and Sugars: In a mixing bowl, cream together the softened butter, granulated sugar, and brown sugar until light and fluffy.
Add Eggs and Vanilla: Beat in the eggs one at a time, then stir in the vanilla extract.
Combine Dry Ingredients: In a separate bowl, whisk together the flour, baking soda, baking powder, and salt.
Mix Together: Gradually add the dry ingredients to the wet mixture, stirring until just combined.
Fold in Pecans and Chocolate Chips: Gently fold in the chopped pecans and white chocolate chips until evenly distributed.
Scoop and Bake: Drop rounded tablespoons of dough onto the prepared baking sheet, spacing them about 2 inches apart.
Bake: Bake in the preheated oven for 10-12 minutes, or until the edges are golden brown.
Cool: Allow the cookies to cool on the baking sheet for a few minutes before transferring them to a cooling rack to cool completely.