high confidence · engineered recipe

Microwave Espresso Brownies

Name: Microwave Espresso Brownies
Total time: 15 min
Yield: 4 servings
Ingredients: 115 g unsalted butter, cut into pieces; 60 g semi-sweet chocolate, chopped; 150 g granulated sugar; 10 g espresso powder; 120 g large eggs plus 1 yolk, room temperature; 5 g vanilla extract; 60 g all-purpose flour; 1 g kosher salt

A rich, fudgy microwave-only brownie infused with robust espresso flavor.

Time15 min

LevelEasy

ToolMicrowave

Yield

4 servings

×1

Units

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Recipe diagramMicrowave Espresso Brownies4 servings · ingredients flow left to right
PrepLine a microwave-safe 8x8 inch glass dish or suitable container with parchment paper for easy removal.
PrepMelt butter and chocolate in short 20 to 30-second intervals to prevent scorching.
115 g · 0.5 cupunsalted buttercut into pieces	01Melt BaseMelt butterPlace butter in a microwave-safe bowl and heat in 30-second bursts until fully melted.				05Microwave CookMicrowave batterPour batter into the prepared microwave-safe dish and microwave on medium power.3 to 4 minutesReady when Edges are set but the center remains slightly soft and glossy	06Rest & CoolRest browniesLet the brownies rest at room temperature so carryover heat finishes setting the center.10 minutesReady when Firm to the touch with moist crumbs on a toothpick
60 g · 2 ozsemi-sweet chocolatechopped	01Melt BaseMelt chocolateAdd chopped chocolate to the warm butter, letting it sit for 1 minute, then stir until smooth.
150 g · 0.75 cupgranulated sugar		02Sweeten & FlavorWhisk sugarVigorously whisk in the granulated sugar and espresso powder until slightly glossy.
10 g · 2 tbspespresso powder
120 g · 2.3 ozlarge eggs plus 1 yolkroom temperature			03Enrich BatterWhisk eggsEnsure the mixture is slightly cooled, then whisk in the eggs, extra yolk, and vanilla extract until smooth.
5 g · 1 tspvanilla extract
60 g · 0.5 cupall-purpose flour				04Fold DryFold flourGently fold in the all-purpose flour and salt using a spatula just until no dry streaks remain.
1 g · 0.25 tspkosher salt

Ingredient ActionHover or tab through a cell to trace its path.

Why this works

Melting chocolate and butter together creates a rich emulsion, while espresso powder intensifies the cocoa notes without adding excess liquid. Short microwave intervals prevent overcooking, and resting allows carryover heat to achieve a fudgy crumb.

Watch for

Overcooking in the microwave leads to dry, cakey brownies; stop cooking when the center is still slightly soft.
Adding eggs to a boiling-hot fat mixture can curdle them; let the melted chocolate-butter base cool slightly first.