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A stack of three fudgy brownies.

How to Make Box Brownies Better

Katelyn Ryan
What makes these box brownies better than the rest? Well, it starts with a few special additions like brewed coffee, instant espresso, and melted butter. These brownies taste rich, fudgy, and utterly scrumptious. You would never know that they started with a boxed brownie mix!
4.67 from 3 votes
Prep Time 10 mins
Cook Time 40 mins
Total Time 50 mins
Course Dessert
Cuisine American
Servings 12 brownies
Calories 332 kcal


  • 1 (20 oz) box brownie mix
  • ½ cup unsalted butter melted
  • 2 large egg yolks
  • cup warm brewed coffee
  • 2 teaspoon vanilla extract
  • 1 tablespoon instant espresso or instant coffee
  • ½ cup semi-sweet chocolate chips or chocolate chunks


  • Preheat the oven to 325° F. Grease and line an 8-inch square baking pan with parchment paper.
  • Mix the brewed coffee, melted butter, egg yolks, and vanilla extract until combined. Whisk in the instant espresso or coffee until dissolved.
  • Using a rubber spatula, fold the brownie mix into the liquid ingredients. Fold in the chocolate chips. Reserve a few extra chips to sprinkle on top of the batter once it is in the pan.
  • Transfer the batter to the prepared pan. Smooth it into an even layer.
  • Bake the brownies for 40-45 minutes, or until the brownies are set. (These brownies are very fudgy, so a toothpick inserted into the center may not come out clean.)
  • Allow the brownies to cool before slicing.


  • TO STORE - Store brownies in an airtight container or zip-top bag. Store at room temperature for up to five days, or in the refrigerator for up to one week.
  • TO FREEZE - Transfer cooled brownies to a freezer-safe zip-top bag. Separate layers with a sheet of wax paper. Freeze for up to 3 months.
  • FOR THE CLEANEST SLICES - Refrigerate the brownies for one hour before cutting. 


Calories: 332kcalCarbohydrates: 41gProtein: 3gFat: 17gSaturated Fat: 8gPolyunsaturated Fat: 1gMonounsaturated Fat: 6gTrans Fat: 1gCholesterol: 52mgSodium: 141mgPotassium: 67mgFiber: 1gSugar: 26gVitamin A: 281IUCalcium: 11mgIron: 2mg
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