Preheat oven to 325°F. Line an 8x8-inch baking pan with foil, leaving a little foil hanging over the sides, and spray the foil with nonstick cooking spray.
Place the 1 box Ghirardelli Double Chocolate Brownie Mix into a medium bowl.
In a small bowl or measuring cup, stir together ¼ cup warm water and 2 teaspoons instant espresso granules until the espresso is dissolved. Add this mixture to the brownie mix.
Stir in ⅓ vegetable oil per package, 1 egg per package, and 1 teaspoon pure vanilla extract until just combined. Do not overmix.
Fold in ¼ cup chocolate covered espresso beans (finely chopped or crushed with a kitchen mallet).
Spoon half of the batter into the prepared pan and spread into an even layer.
Evenly place the 9 Ghirardelli Mocha Squares over the batter.
Top with the remaining batter and spread gently to cover the Ghirardelli Mocha Squares in an even layer.
Bake in the preheated oven for 40–43 minutes, or until a toothpick inserted near the center comes out with a few moist crumbs.
Cool completely in the pan on a wire rack before using the foil overhang to lift the brownies out and cut.