The four-minute brownieBean · cocoa · mug · spoon

Two mugs · one processor

Black Bean Brownie Mug Cake

Black beans, whole-wheat flour, cocoa, honey, almond milk, egg, and chocolate chips blended into two warm mug brownies in four source-clock minutes.

Blend the brownies

A chocolate brownie in a white mug topped with melting vanilla ice cream. — **This open-license mug brownie is illustrative and topped with vanilla ice cream; Mary Frances’s source version is finished only with chocolate chips.**Photo by Miamistill · CC BY-SA 4.0

Prep: 2 minutes
Microwave: 2–3 minutes
Makes: 2 mugs
Power: 7 of 10

The secret is not simply that beans can hide in chocolate. It is that Mary Frances’s 2014 mug brownie gives each ingredient a compact structural job: beans bring body, whole-wheat flour steadies it, honey and almond milk loosen it, egg sets it, and cocoa plus melting chips make the identity unmistakable.

The source formula deserves to stay small and specific. Blend the beans alone before building the batter, divide it into two shallow portions, and use the recorded medium-power setting instead of punishing the edges on full blast. The result is meant to be moist and spoonable—brownie territory, not a tall, dry microwave sponge.

“A dairy free healthy brownie made in a mug! No one would ever guess its secret ingredient – promise.”

Purée first

Turn the rinsed beans completely smooth before flour, cocoa, honey, milk, vanilla, and egg enter the processor.

Split evenly

Two microwave-safe vessels keep the shallow portions close to the source’s four-minute clock.

Stand one minute

The hot center finishes settling while the mug and melted chocolate lose their fiercest heat.

Batter anatomyBody structure sweetness set

Nine ingredients, four structural moves

The short list works because purée, flour, liquid, and egg stay in careful balance; the chocolate chips finish the argument.

Black beans

One-half cup supplies the soft body and moisture that let this tiny batter eat more like a fudgy brownie than an airy sponge.

Rinse, drain well, and process alone first so no recognizable skins survive.

Whole-wheat flour + cocoa

Two tablespoons of each give the purée enough structure and a decisive chocolate profile without turning it into a conventional flour cake.

Measure level tablespoons; the batch is small enough that a heaped spoon changes the texture.

Honey + almond milk

Equal two-tablespoon measures sweeten and loosen the batter while keeping the source formula dairy-free.

Drain the beans before measuring these liquids so the batter does not inherit extra water.

Egg + chocolate chips

The egg sets the blended batter; chips melt across the top and supply concentrated pockets of chocolate.

Check the egg-based center for 160°F, then stop—the residual minute of standing does the final settling.

Black + brownThe hidden base and visible flavor

Blend one dark ingredient into another

A tight overhead field of uncooked matte-black beans. — **The source calls for one-half cup cooked, rinsed black beans. Blend until their skins disappear into the cocoa-dark batter.**Photo by Bean appreciator · CC0 1.0

Smooth is the disguise

Stop and scrape the processor. One stubborn bean skin is more revealing than the entire half-cup purée.

A clear glass bowl filled with deep brown cocoa powder on a white surface. — **Two tablespoons of cocoa steer the small bean-and-whole-wheat batter firmly toward brownie territory.**Photo by thecakeschool · CC0 1.0

Source clockPurée blend split heat stand

From pantry to spoon in five minutes

The card counts four minutes through cooking; its final one-minute cooling step is the quiet finish that makes the center spoon-ready.

0:00
Erase the beans
Blend the rinsed, drained beans alone until the processor bowl holds a smooth dark purée.
0:45
Build the batter
Add flour, cocoa, honey, almond milk, vanilla, egg, and baking powder; blend completely smooth.
1:30
Divide and dot
Split between two microwave-safe mugs, leave headroom, and scatter one tablespoon chips over each.
2:00
Start on medium
Microwave at power 7 of 10. The source window is 2 to 3 minutes, with 2:30 as its recorded sweet spot.
4:00
Read the centers
Look for set, moist tops and 160°F centers; add only 10-second bursts when either portion still looks liquid.
5:00
Spoon while warm
After the one-minute stand, the crumb should be fudgy and the chocolate chips soft enough to streak.

Microwave dialMedium power short checks

Let wattage choose the last seconds

Utah State University Extension notes that wattage changes cooking speed. Keep the source setting, then use the center—not habit—to decide when to stop.

Source setting

Power 7 of 10 · 2:30

Mary Frances’s exact benchmark for two portions cooked together.

High-watt microwave

Check at 2:00

Stop if both centers are set and at 160°F; short bursts protect the moist crumb.

Low-watt microwave

Continue toward 3:00

Add 10 seconds at a time rather than jumping straight to full power.

Doneness cuesSmooth set moist hot

Read the brownie before the timer

Microwave time is a range. These cues protect both the source’s fudgy intent and the raw-flour, raw-egg safety step.

No bean skins

The first purée should look uniform before the dry ingredients go in; this is the key disguise.

Chocolate-brown batter

After the second blend, no pale flour pockets or streaks of egg should remain along the bowl.

Set, not dry

The top should lose its liquid sheen while the center remains moist and reaches the safe egg-dish temperature.

Soft chips after standing

The one-minute pause lets the crumb settle and the topping melt without another blast of microwave heat.

Black bean brownie mug cake

A smooth black-bean, whole-wheat, cocoa, and honey batter split between two mugs, topped with chocolate chips, and microwaved on medium power.

Mug CakeBrowniesBlack BeansMicrowave DessertWhole WheatDairy-Free

Ingredients

Two mug brownies

1/2 cup cooked black beans, rinsed and well drained
2 tablespoons whole-wheat flour
2 tablespoons unsweetened cocoa powder
2 tablespoons honey
2 tablespoons almond milk
1 teaspoon vanilla extract
1 large egg
1 pinch baking powder
2 tablespoons Enjoy Life chocolate chips

Directions

Put the rinsed, well-drained black beans in a food processor. Blend until no whole beans remain, stopping once to scrape the bowl so the skins are pulled back into the purée.
Add the whole-wheat flour, cocoa powder, honey, almond milk, vanilla, egg, and pinch of baking powder.
Blend again until the batter is completely smooth and evenly chocolate-brown. Scrape the bottom and sides, then pulse once more if any pale flour or bean flecks remain.
Divide the batter evenly between two microwave-safe mugs or ramekins. Keep enough headroom for the cakes to rise.
Sprinkle one tablespoon of chocolate chips over each portion.
Microwave the two portions at medium power for 2 to 3 minutes. Mary Frances used power 7 out of 10 for 2 minutes 30 seconds; because microwave wattage varies, begin checking at 2 minutes.
The cakes are ready when the tops look set, the centers remain moist rather than liquid, and each center reaches 160°F (71°C). If needed, continue in 10-second bursts so the edges do not turn rubbery.
Let the mugs stand for 1 minute before serving. The vessels and melted chocolate will be hot, and the centers continue to settle during the pause.

Why it works

Blending the beans alone first turns their skins and starch into a smooth base. Whole-wheat flour gives that purée just enough structure, while honey and almond milk keep the tiny batter fluid. The egg sets during the medium-power microwave step; the gentler setting buys the center time to cook before the outside dries. Chocolate chips melt from the top down, and the final one-minute stand lets the crumb settle without stealing its fudgy texture.

Source formula, blending, microwave power, safety, serving, allergens, and nutrition note

Mary Frances’s source formula is preserved: one-half cup black beans, 2 tablespoons each whole-wheat flour, cocoa, honey, and almond milk, 1 teaspoon vanilla, 1 egg, a pinch of baking powder, and 2 tablespoons Enjoy Life chocolate chips, divided into two mugs.
Drain the rinsed beans thoroughly. Extra surface water loosens a batter whose liquid is already tightly measured at 2 tablespoons almond milk and 2 tablespoons honey.
Blend the beans before adding the remaining ingredients, exactly as the primary recipe directs. A fully smooth first purée prevents pieces of skin from reading as beans in the finished crumb.
Use only microwave-safe mugs or ramekins without metallic paint or trim. Utah State University Extension notes that microwave wattage changes cooking speed, so the source’s 2-to-3-minute window is a starting range rather than a universal endpoint.
Keep the medium-power setting. Mary Frances recorded power 7 of 10 for 2 minutes 30 seconds; a gentler setting gives the egg-and-bean batter time to set through before the outer ring dries.
Do not taste the uncooked batter. FDA guidance treats flour as a raw food, and this batter also contains raw egg; cooking is the safety step for both.
For the egg-based center, FoodSafety.gov lists 160°F (71°C) for egg dishes. Check the center, then use short additional bursts only if needed; the brownie should be set and moist, not fluid or chalky.
Serve immediately after the 1-minute stand. This two-mug formula is designed as a warm, just-cooked dessert rather than a make-ahead cake.
Allergen note: the recipe contains wheat and egg. Almond milk contains tree nuts; verify the chocolate-chip package for current milk, soy, and cross-contact statements if those allergens matter.
Nutrition is omitted. The syndicated panel claims 339 calories and 15 grams protein per serving, but those values do not reconcile reliably with the stated nine-ingredient, two-serving formula.

Equipment

Food processor or high-speed blender
Flexible spatula
Measuring cups and spoons
2 microwave-safe mugs or ramekins, about 10 to 12 ounces each
Microwave
Instant-read thermometer, recommended for checking the egg-based center

Nutrition

Nutrition is omitted because the syndicated values do not reconcile reliably with the stated formula and two-serving yield.

Source and technique references: Mary Frances’s complete March 28, 2014 primary recipe for the formula, two-serving yield, 2/2/4-minute clock, medium-power setting, and one-minute stand; the exact queued My Recipe Magic card for legacy ID 2501391899 and the syndicated nutrition record; the FDA on raw-flour and batter safety; FoodSafety.gov’s 160°F guidance for egg dishes; Utah State University Extension on microwave wattage, safe vessels, hot containers, and standing time; and USA Pulses’ two-serving pulse mug cake as independent corroboration for a smooth processor batter, medium-power 2-to-3-minute cook, and cooling pause.

Image credits

Photography is used under open licenses with attribution: Miamistill, Bean appreciator, and thecakeschool.