Reduce coffee down to 2 Tablespoons, remove from heat, and set aside.
COFFEE BROWNIES
Preheat the oven to 350ºF (177ºC). Line an 8" or 9" square baking pan with foil and spray with nonstick spray. Set aside.
In a medium saucepan over medium heat, melt the butter and chopped chocolate, stirring frequently until completely smooth. Allow to cool for about 15 minutes.
½ cup (113g) unsalted butter, 8 ounces (227g) semi-sweet chocolate
Whisk both sugars into cooled chocolate mixture until combined. Add the eggs one at a time, whisking after each addition until smooth. Whisk in 1 Tablespoon of the concentrated coffee. Add the flour and salt and stir gently until completely combined.
¾ cup (150g) firmly packed light brown sugar, ¼ cup (50g) granulated sugar, 3 large eggs, 1 Tablespoon (15mL) concentrated coffee, ¾ cup (90g) all-purpose flour, ¼ teaspoon salt
Pour the batter into the prepared pan. Bake brownies for 25-30 minutes or until a toothpick inserted in the center comes out mostly clean. Allow brownies to cool completely before frosting.
MOCHA FROSTING
In a small saucepan over medium heat, melt the unsweetened baking chocolate and the butter. Allow to cool for 15 minutes.
In a medium bowl with a handheld mixer or the bowl of a stand mixer fitted with the paddle attachment, combine cooled chocolate/butter mixture, concentrated coffee, and milk or cream (start with 1 Tablespoon). Turn the mixer onto low and slowly add the powdered sugar. Increase mixer speed to medium and beat until completely combined, scraping down sides as needed. Add salt to taste.
1 Tablespoon (15mL) concentrated coffee, 1 to 2 Tablespoons (15-30mL) milk or cream, 2 cups (240g) powdered sugar, pinch of salt
When you are ready to frost the brownies, remove the brownies by lifting the foil overhang straight up. Peel back remaining foil and place brownie block onto a large cutting board or safe-to-cut surface.
Spread frosting evenly over the top of the brownies, then cut into individual servings. Store leftover brownies at room temperature up to 1 week. Brownies freeze well, up to 3 months. Thaw in refrigerator overnight.
Notes
Room temperature eggs: these incorporate into batter much more easily than cold eggs, although this is not absolutely necessary.
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Nutrition Disclosure
All nutritional values are approximate and provided to the reader as a courtesy. Changing ingredients and/or quantities will alter the estimated nutritional calculations.