Grandma's 5-Minute Lemon Mug Cake
5-Minute Lemon Mug Cake
A soft, bright lemon mug cake made in the microwave with pantry staples, finished with a quick lemon glaze for a warm dessert in five minutes.
This little lemon cake keeps the spirit of a grandmother's kitchen without asking you to heat the oven or wash a stack of bowls. It is mixed right in a mug, cooked until just set, and brightened with enough fresh lemon to taste homemade instead of merely sweet.
The texture is soft and spoonable, closer to a tender snack cake than a dry sponge. Melted butter gives it a familiar bakery richness, while milk and lemon juice keep the crumb moist. A short rest after microwaving matters because the cake finishes setting as the steam settles.
The glaze is simple on purpose: powdered sugar, lemon juice, and a pinch of zest if you have it. It melts over the warm cake and makes the whole mug smell like a lemon loaf cooling on the counter, only much faster.
Nutrition (per serving)
Directions
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1
Use a microwave-safe mug that holds at least 12 ounces so the cake has room to rise.
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2
Add the flour, granulated sugar, baking powder, and salt to the mug and stir with a fork until no pockets of baking powder remain.
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3
Pour in the milk, melted butter, 1 tablespoon lemon juice, lemon zest, and vanilla, then stir just until the batter looks smooth.
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4
Scrape the sides of the mug with the fork so the batter sits evenly in the bottom.
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5
Microwave on high for 60 to 75 seconds, until the top looks set and springs back lightly when touched.
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6
Let the mug cake rest for 1 minute; it will finish cooking gently from its own steam.
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7
Stir the powdered sugar with 1 teaspoon lemon juice until spoonable, adding a few extra drops of lemon juice only if needed.
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8
Drizzle the glaze over the warm cake and eat while soft and fragrant.
Ingredients
- All-purpose flour:4 tbsp
- Granulated sugar:3 tbsp
- Baking powder:1/4 tsp
- Fine salt:1 pinch
- Milk:3 tbsp
- Unsalted butter, melted:1 1/2 tbsp
- Fresh lemon juice:1 tbsp
- Lemon zest:1/2 tsp
- Vanilla extract:1/4 tsp
- Powdered sugar:2 tbsp
- Fresh lemon juice for glaze:1 tsp
Tips & Notes
- For the best texture, stop microwaving as soon as the top is set; overcooking makes mug cakes firm.
- A wider mug cooks more evenly than a tall narrow one.
- Add a spoonful of blueberries to the batter for a lemon-blueberry version.
