Preheat the oven to 350 degrees. In a large mixing bowl, cream together butter and sugars until fluffy. Add vanilla extract and eggs and beat until creamy.

In a medium bowl, stir together the flour, baking soda and salt. Gradually add the dry ingredients to the butter mixture while mixing on low speed. Stir in the dark chocolate chunks and the pecans. Chill the dough for 30 minutes.

Using a scoop, drop rounded tablespoonfuls onto a cookie sheet lined with parchment paper. Cookies should be 2 inches apart.