Preheat oven to 325°. Line a 9-in.-square baking pan with parchment paper, letting ends extend up sides. In a large heavy saucepan, combine sugars, butter, water and, if desired, coffee granules; bring to a boil, stirring constantly. Remove from heat; add 1-3/4 cups chocolate chips and stir until melted. Cool slightly.

In a large bowl, whisk eggs until foamy, about 3 minutes. Add vanilla; gradually whisk in chocolate mixture. In another bowl, whisk flour, baking soda and salt; stir into chocolate mixture. Fold in remaining chocolate chips.

Pour into prepared pan. Bake on a lower oven rack 40-50 minutes or until a toothpick inserted in center comes out with moist crumbs (do not overbake). Cool completely in pan on a wire rack.

Lifting with parchment paper, remove brownies from pan. Cut into squares.