Biscoff Mug Cake: The 5-Minute Dessert That You Will Fall In Love With
This Biscoff mug cake is a single serving of warm, caramel-spiced sponge built almost entirely around Lotus Biscoff cookie butter. Everything stirs together in one mug and microwaves in about a minute, and if you pull it a few seconds early the middle stays soft and molten under a spoon.
Why you'll love this
- Start to finish in about five minutes, all mixed and cooked in one mug
- Deep caramel-and-cinnamon flavour comes ready-made from the Biscoff spread
- No oven, no mixer and barely any washing up
- Easy to keep gooey in the centre, or cook a touch longer for a fluffier crumb
Key ingredients & swaps
- Biscoff cookie butter — the whole flavour and much of the fat; warm it for about 10 seconds first so it loosens and stirs in smoothly instead of leaving stubborn streaks, and save a spoonful to melt on top.
- All-purpose flour — the structure that turns the spread into cake; spoon and level it so you don't pack in too much, which is the fast track to a dry, dense mug cake.
- Milk — the moisture that brings the batter together; dairy or non-dairy both work, and it should make a thick but smooth, pourable batter.
- Vegetable oil or melted butter — keeps the crumb tender and moist rather than rubbery; oil gives the softest result, butter adds a little extra flavour.
- Baking powder — the lift that keeps it light in the short microwave blast; measure it accurately, as too much can make the cake taste soapy and dome then collapse.
- Vanilla extract — a small lift to the spiced caramel notes; optional, but it rounds out the flavour.
How to make it (step by step)
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1Warm the Biscoff
Spoon the cookie butter into a large microwave-safe mug and microwave about 10 seconds until it loosens. This softens it so it blends in completely instead of sitting in lumps.
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2
Stir in the wet
Add the milk, oil or melted butter and vanilla and stir until completely smooth. Scrape the spread up from the bottom of the mug so none of it hides there.
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3
Add the dry
Tip in the flour, baking powder and a pinch of salt and stir just until no dry streaks remain. Stop there - overmixing develops gluten and turns the cake tough and chewy.
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4
Microwave
Microwave on full power about 1 minute for a roughly 1000-watt oven, then add 10 to 15 second bursts only if needed. It is done when the top springs back lightly and looks just set.
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5
Top and serve
Let it cool for a minute or two, then add a melted spoonful of Biscoff, a few crushed biscuits or a scoop of ice cream. Eat it warm, when it is at its softest and most molten.
Pro tips
- For a molten middle, pull it 5 to 10 seconds early - the residual heat keeps cooking the centre, and a fully set top means it is already drying out.
- Use a mug that holds at least 12 ounces; the batter climbs as it cooks and a small mug overflows.
- Microwave wattage varies a lot, so cook to the spring-back cue rather than the clock and adjust in short bursts.
Variations
- Extra gooey: push a spare teaspoon of Biscoff into the centre of the batter before microwaving so it melts into a molten pocket.
- Chocolate Biscoff: stir a few chocolate chips into the batter for melty pockets through the cake.
- Dairy-free: use plant milk and oil, and check your cookie butter is dairy-free (most Biscoff spread is).
Storage & freezing
Mug cakes are made to eat fresh and warm; if you must, cover and keep it at room temperature for up to a day, but it firms up and loses its soft centre as it sits.
Recipe
Biscoff Mug Cake: The 5-Minute Dessert That You Will Fall In Love With
Ingredients
- 3 tbsp Biscoff cookie butter
- 4 tbsp all-purpose flour
- 1 tbsp Sugar
- 1/4 tsp Baking Powder
- Salt pinch
- 4 tbsp of milk (dairy, or non-dairy).
- 1 tbsp vegetable or melted butter
- 1/4 tsp vanilla extract (optional)
Instructions
- Microwave cookie butter in a mug for 10 seconds.
- Add the milk, oil and vanilla. Stir until smooth.
- Add the flour, baking powder and salt. Mix until there are no dry spots.
- Microwave 1 minute. Add 10-15 seconds to texture if necessary.
- Enjoy warm food and a little cooling!
Tips & notes
- Do not overmix - it will keep the cake light.
- Microwave time can be adjusted slightly depending on the wattage.
- Add crushed Biscoff or ice cream to the top for an instant upgrade.
- Undercook your food by 5-10 second for a gooey texture.
- It is best to enjoy it fresh. However, you can keep it covered up to one day.
Watch how to make it
Nutrition · per serving (estimate)
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Frequently asked questions
Why did my mug cake turn out dry or rubbery?
Almost always overcooking or too much flour. Microwaves keep cooking from residual heat, so stop the moment the top springs back, and spoon and level the flour rather than scooping straight from the bag.
How do I keep the centre gooey?
Slightly undercook it - pull the mug 5 to 10 seconds before the top looks fully set, and for an extra-molten core push a teaspoon of Biscoff into the middle of the batter before microwaving.
My microwave is more or less powerful than 1000 watts - how do I adjust?
Cook to the cue, not the timer. A higher-wattage oven may need only 40 to 50 seconds; a lower one a bit more. Start short and add 10 second bursts until the top just springs back.
Why warm the Biscoff before mixing?
Cold cookie butter is stiff and leaves lumps you can't fully stir out. Ten seconds in the microwave loosens it so it blends evenly into the batter for a smooth crumb.
Can I make this without a microwave?
Yes - use an oven-safe ramekin and bake at around 350F (175C) for 12 to 15 minutes, until the edges are set and the centre is just firm. It will be a little more cake-like and less molten than the microwave version.
Why does my mug cake overflow?
The batter rises a lot in the microwave, so a small mug spills over. Use one that holds at least 12 ounces (about 1.5 cups) and fill it no more than two-thirds full.
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