Peanut Butter
Peanut Butter Jam Mug Cake
Vegan peanut butter cake with a warm jam ribbon through the middle.
Steps
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Whisk flour, brown sugar, baking powder, and salt in the mug.
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Stir oat milk, peanut butter, oil, and vanilla together in the dry mix until no flour pockets remain.
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Drop jam on top and drag the fork through twice to make a loose ribbon.
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Microwave 75-85 seconds. Peanut butter holds heat, so the top should be set but not dry.
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Rest two minutes before eating so the jam cools from molten to spoonable.
Tips from the test kitchen
Natural peanut butter works if it is well stirred. Dry peanut butter makes the cake dense and chalky.
Success guide
Make it work the first time
Expected texture
Expect a rich, slightly dense crumb with a warm peanut butter ribbon. Stop before the top looks dry because nut butter holds heat after cooking.
Success tips
- Use a microwave-safe mug with visible headroom. If the batter fills more than about half the mug, move it to a larger mug before cooking.
- Start with the lower end of the microwave time in the steps. Add time in short bursts only if the center still looks wet.
- Let the cake rest before eating. The crumb keeps setting after the microwave stops, and the mug will be very hot.
- This recipe avoids a whole egg, which helps prevent the bouncy texture people often dislike in small mug cakes.
Substitutions
- Plant milk
- Use the milk listed in the recipe for the most predictable texture. Thinner plant milks may need a few seconds less cooking.
- Fat
- Neutral oil keeps mug cakes moist. Melted butter works in some chocolate or vanilla cakes, but it can make the crumb firmer as it cools.
- Flour
- Do not assume a direct gluten-free flour swap unless the blend is labeled cup-for-cup; the texture may turn gummy.
- Mix-ins
- Keep heavy mix-ins near the center of the batter. If they touch the mug wall, they can overheat before the cake finishes.
Troubleshooting
- Rubbery texture
- Usually caused by overmixing, overcooking, or too much egg for one mug. Mix only until no dry flour remains and stop at the first set-top cue.
- Dry crumb
- The cake likely cooked too long. Next time start at the low end of the time range and let rest instead of microwaving until fully dry.
- Overflow
- The mug was too small or too full. Use more headroom and set the mug on a paper towel if your microwave runs hot.
- Wet center
- Microwave in one short burst, then rest again. A slightly glossy center is fine; a puddle of batter needs more time.
Variations
- Add a small jam spoonful after cooking for a peanut-butter-and-jam finish.
- Sprinkle chocolate chips on top before microwaving for a warmer dessert cup.
- Add a fresh spoonful of jam after cooking if you want brighter fruit flavor.
- Top with coconut yogurt or dairy-free ice cream after resting.
