6 ways to upgrade a box of brownie mix, from a former pastry cook
For an extra kick of richness and a bit of flair, dollop teaspoons of nut butter on ... the water in the box's directions ...
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8 of the best ways to upgrade a box of brownie mix, from a professional baker
Use brewed coffee in place of water for brownies with more depth. Most brownie mixes call for a few tablespoons of water on the back of the box ... frosting or peanut-butter icing.