Preheat the oven to 350 degrees F. Place pecans in a single layer on a baking sheet, and bake in preheated oven until toasted and fragrant, 6 to 8 minutes, stirring halfway through. Let cool completely, about 20 minutes. Line 2 large baking sheets with parchment paper; lightly coat parchment with cooking spray. Sift together powdered sugar, Ghirardelli Premium Baking Cocoa, and salt in a large bowl. Whisk egg whites in a separate bowl until frothy, about 1 1/2 minutes. Stir egg whites and vanilla into powdered sugar mixture. Batter will be very thick. Stir in Ghirardelli Bittersweet Chocolate Chips and toasted pecans until well combined. Using a 1 1/2-inch cookie scoop (about 2 tablespoons), scoop dough, and place 3 inches apart on prepared baking sheets. Bake in preheated oven until tops are shiny and cracked, 8 to 10 minutes. Cool on baking sheet 5 minutes; transfer to wire racks and cool completely, about 15 minutes.