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Preheat your oven to 350°F (175°C) and prepare an 8-inch baking dish by coating it with non-stick spray or lining it with parchment paper, followed by a light spray of non-stick spray.
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In a microwave-safe bowl, melt the butter in the microwave. Once melted, transfer the butter to a large mixing bowl.
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To the bowl with the butter, add the sugar, eggs, and vanilla extract, stirring until everything is thoroughly blended.
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Gradually add the flour, cocoa powder, salt, and baking powder to the wet ingredients, and mix until the batter is smooth and fully combined.
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Spread the batter evenly into the prepared baking dish and place it in the oven. Bake for 30–35 minutes, or until a toothpick inserted into the center comes out clean.
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Allow the brownies to cool completely before starting on the frosting.
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For the frosting, dissolve the instant coffee granules in the heavy whipping cream and set aside.
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In a separate bowl, beat the unsalted butter until it becomes light and fluffy. Gradually add the powdered sugar, mixing until fully combined.
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Slowly pour in 2 tablespoons of the coffee-infused cream and mix well. If needed, continue adding more cream, 1 tablespoon at a time, until the frosting reaches your preferred consistency.
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Once the frosting is ready, generously spread it over the cooled brownies. Slice and serve to enjoy!
Frosted Coffee Brownies
Notes
For stronger flavor, increase instant coffee to 2 tablespoons. Ensure brownies are completely cooled before frosting to avoid melting. Store leftovers in an airtight container at room temperature for up to 3 days or refrigerate for up to a week.