Preheat oven to 350°F. Spray 9 in. x 13 in. pan with vegetable pan spray.
2
In small bowl, whisk together flour, cocoa powder and salt.
3
In large bowl, whisk together sugar and melted butter until combined. Add eggs, one at a time, and vanilla. Whisk until smooth. Fold in flour mixture until well-combined. Pour batter into prepared pan and spread into an even layer.
4
Bake 30-35 minutes or until toothpick inserted in center comes out almost clean. Cool completely in pan on cooling grid before cutting.