Directions

1. Preheat oven to 350° F. Line an 8x8 inch baking pan with foil and spray with nonstick cooking spray. Set aside.
2. Microwave Ghirardelli® 60% Cacao Bittersweet Chocolate Baking Chips and butter in a large bowl microwave-safe bowl at medium (50%)power. Stir every 30 seconds until chocolate and butter are melted and smooth.
3. In a small bowl, combine orange zest and sugar, mixing with your fingertips until the sugar is fragrant and the zest is incorporated. Add sugar, eggs, vanilla, orange liqueur (if using) and salt to the chocolate mixture and whisk to combine. Gradually add in flour; stir until just combined.