Mix the sugar, lemon zest, and vanilla bean powder together.   Add diced peaches.   Add GIANT blackberries, arrowroot powder, lemon juice, and salt.   Toss to combine and place in a casserole dish.   Plop biscuits on top.   Bake until biscuits are a beautiful golden color. Peach Blackberry Cobbler Recipe Type: Dessert Cuisine: