Topping Instructions Combine brown sugar, orange zest, cinnamon, and flour in bowl. Cut in butter until mixture is crumbly. Set aside. Batter Instructions Combine dry ingredients in large mixing bowl. In a separate bowl, whisk together orange juice, orange zest, milk, oil, and egg. Add to dry ingredients and gently stir until just mixed. Place batter in greased 8-inch baking pan and sprinkle the topping on top. Bake at 375 degrees F for about 25 minutes or until cooked through.