Preheat the oven to 350°F. Spread the nuts in a single layer on a baking sheet. Toast for 6-8 minutes until golden. Cool completely.
Spray a 13x9-inch metal non-stick baking pan with baking spray or brush with melted butter.
In a medium size mixing bowl use a whisk to combine oats, flour, baking soda and salt.
Using an electric mixer cream together butter, granulated sugar, brown sugar and vanilla.
Beat for 2 minutes over medium-high speed until fluffy and combined. To the bowl, add the eggs one at a time beating well after each addition.
Lower the speed of the mixer and gradually add the dry ingredients to the creamed mixture. Stop and scrape the sides of the bowl as needed. Beat just until fully moistened.
Mix the entire package of milk chocolate chips and 1 cup chopped pecans into the dough by hand.
Spread the cookie dough into the prepared pan and sprinkle the top with the remaining 1/2 cup chocolate chips and chopped pecans.
Bake for 30-35 minutes until golden brown and a toothpick inserted into the center shows moist crumbs.
Cool completely in the pan on a wire rack, then use a sharp knife to slice into bars.