Yet these have a zesty lemon twist that takes them completely over the top. The best thing about these bars is how ridiculously easy they are to make, all thanks to a box of cake mix. Plus ...

lemon juice, vanilla, and 2 to 3 drops of the food coloring, if using. Pour the mixture over the cake mix in the pan and spread evenly. Bake until the top is golden and develops a shiny crust ...