Servings: 12    1 20 ounce Ghirardelli brownie mix, any variety  6 ounces halvah, any flavor, divided  1/4 cup 100% tahini    Preheat oven to 350°F. Line a 9×13-inch casserole with parchment paper. Prepare brownie mix batter according to package directions.  Break up large chunks of halva and place them on the bottom of prepared […]