4 teaspoons instant coffee granules, or more to taste
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1 tablespoon hot water
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4 large eggs
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1 cup all-purpose flour
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2 teaspoons vanilla extract
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0.5 teaspoon salt
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0.5 cup butter, softened
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1 teaspoon vanilla extract
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2 cups confectioners' sugar
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1 tablespoon instant coffee granules
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1.5 tablespoons milk
Instructions
Preheat the oven to 350 degrees F (175 degrees C). Grease a 9x13-inch baking pan.
Make brownies: Melt shortening and butter in a small pan over low heat; pour melted mixture into a mixing bowl. Stir cocoa into butter mixture until well combined, followed by sugar.
Dissolve instant coffee with hot water in a small bowl; stir into cocoa mixture. Whisk eggs into batter, one at a time, beating well after each addition. Stir flour, vanilla extract, and salt into batter just until moist. Pour batter into the prepared baking pan.
Bake in the preheated oven until a toothpick inserted into the center comes out with moist crumbs, 25 to 30 minutes. Cool completely.
Make frosting: Beat softened butter with vanilla extract in a bowl. Add confectioners' sugar; beat until creamy using an electric mixer on medium speed. Dissolve instant coffee with milk in a small bowl; add to frosting. Increase mixer speed to high and beat until light and fluffy, 3 to 5 minutes. Frost cooled brownies.