I just whipped up a Gluten Free Mug Brownie that’s tender, fudgey, and so chocolatey it totally ruined my willpower.

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I’m obsessed with this messy, fudgey Chocolate Chip Mug Cookie that hits like a tiny chocolate bomb. I love that it’s a Gluten Free Mug Cake that actually tastes indulgent, not sad.

It’s dense and tender, super chocolatey from unsweetened cocoa powder and studded with chocolate chips for molten little bites. I adore the way it crumbles against a spoon and leaves streaks of melted chocolate on the mug.

And yes, it’s dessert without ceremony. Pure chocolate focus.

No forks, no patience, just a mug and too much joy in one spoon. A single warm bite shuts everything up now.

Ingredients

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Gives structure and body, so your mug cookie actually holds together.
Rich chocolate punch, slightly bitter, makes it feel like dessert.
Adds moisture and chew, plus that caramel-y sweetness you want.
Helps it puff a bit, keeps the texture from being too dense.
Tiny pinch cuts the sweetness and makes chocolate taste real.
Adds fat for richness and slightly crispy edges, so good.
Makes the batter smooth and tender, use any kind you like.
Basically a flavor boost, warms everything up and smells amazing.
Plus the egg yolk gives silkiness and protein, makes it fudgy.
Plus chips give melty pockets, sprinkle extra for gooey bites.

Ingredient Quantities

4 tbsp gluten free all purpose flour

2 tbsp unsweetened cocoa powder

3 tbsp packed brown sugar

1/4 tsp baking powder

pinch of salt

1 tbsp melted butter or coconut oil

1 tbsp milk (dairy or plant based)

1/2 tsp vanilla extract

1 large egg yolk

2 tbsp chocolate chips plus extra for sprinkling

How to Make this

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1. Grab a microwave safe mug (10-12 oz is best) and melt 1 tbsp butter or coconut oil in it for about 10-15 seconds so it’s liquid and warm but not smoking.

2. Add 4 tbsp gluten free all purpose flour, 2 tbsp unsweetened cocoa powder, 3 tbsp packed brown sugar, 1/4 tsp baking powder and a pinch of salt right into the mug.

3. Stir the dry ingredients with a fork to break up lumps, do a quick taste test of the dry sugar if you must, guilty pleasure, i know.

4. Add 1 tbsp milk, 1/2 tsp vanilla extract and 1 large egg yolk to the mug. Pour the melted butter in too.

5. Stir everything together until mostly smooth; a few tiny flour bits are ok, don’t overmix or it can get tough.

6. Fold in 2 tbsp chocolate chips, saving a few extra to sprinkle on top so it looks fancy and melts on the surface.

7. Tap the mug on the counter to settle the batter and push it a little toward the edges so it cooks evenly.

8. Microwave on high for 45 to 60 seconds. Start checking at 45 seconds, the top should look set but still fudgy. If it’s pudding like in the middle, that’s perfect. If it’s very wet, add 5 to 10 second bursts.

9. Let the cookie cool in the mug for 1 to 2 minutes, sprinkle the reserved chips on top so they melt, then dig in with a spoon. If you want a crisper top, broil for 30 seconds in a toaster oven but watch it close.

Equipment Needed

1. Microwave-safe mug (10 to 12 oz is best)
2. Microwave (or toaster oven if you want a crisper top)
3. Measuring spoons (tbsp and 1/4 tsp)
4. Measuring tablespoon for the flour and sugar (or a small dry measuring cup)
5. Fork for stirring and breaking up lumps
6. Small spoon or spatula to fold in chips and scrape sides
7. Teaspoon for adding milk and vanilla
8. Oven mitt or towel for handling a hot mug
9. Small plate or trivet to set the mug on while it cools

FAQ

Can I use a whole egg instead of just the yolk? Yes, you can, but using the whole egg makes the cookie more cake like and puffier. The yolk keeps it denser and cookie-ish.

How do I stop the mug cookie from being rubbery? Don’t overcook it. Pull it when the top is set but still a little soft. Microwaves cook fast, so check early. Also avoid skipping the baking powder, it helps texture.

Can I bake this in the oven instead of microwave? Sure. Put the batter in a small oven safe ramekin and bake at 350°F for about 10 to 12 minutes. Check for a slightly soft center.

Is this safe for people with gluten allergies? Only if you use a certified gluten free all purpose flour. Cross contamination can happen, so make sure your flour is labeled gluten free.

How do I make it vegan? Use melted coconut oil instead of butter, a plant milk, and replace the egg yolk with 1 tbsp of applesauce or 1 tbsp mashed banana. Texture will change a bit but it still tastes great.

Can I add mix-ins like nuts or peanut butter? Yes. Stir in a tablespoon of chopped nuts or a teaspoon of peanut butter into the batter. Just don’t add too much or it may affect cooking time.

Easy Gluten Free Mug Cookie Recipe Substitutions and Variations

Gluten free all purpose flour: swap with 3 tbsp almond flour plus 1 tbsp tapioca starch for lighter texture, or use 4 tbsp certified gluten free oat flour if you want a chewier bite.
Melted butter or coconut oil: use melted vegan butter or neutral oil like avocado or grapeseed oil in a 1:1 ratio, coconut oil will add a light coconut note so watch the flavor.
1 large egg yolk: replace with 1 tbsp applesauce or 1 tbsp mashed banana for moisture, or for more binding use 1 tbsp ground flax mixed with 3 tbsp water (let sit 5 minutes) to mimic eggy structure.
Milk (dairy or plant based): use almond milk, oat milk, or thin plain yogurt (stir with a splash of water to match milk consistency) as easy swaps depending on what you have.

Pro Tips

1) Watch your microwave time, every oven is different. Start at 45 seconds and check, then add 5 to 10 second bursts if needed. It should be set on top but still a little fudgy in the middle — sorry, not allowed. It should jiggle slightly when you shake the mug.

2) Don’t overmix. Stir just until mostly smooth; a few tiny flour bits are fine. Overworking the batter makes it tough, especially with gluten free flour.

3) Warm the fat, not hot. Melt the butter or coconut oil until just liquid and warm, not smoking. If it’s too hot it can cook the egg yolk or make the batter greasy.

4) Let it rest 1 minute in the mug after microwaving. Carryover heat finishes the center while the edges firm up, and the melted chips on top will sink and look way more appetizing.