This mug brownie is my go-to when I need chocolate, and I need it fast. It’s a single-serving, gluten-free brownie you can mix and microwave in under a minute. No fuss, no oven, just a warm, fudgy square-sized treat that fits in a mug.

Ingredients are simple: gluten-free all-purpose flour, coconut sugar, cocoa powder, a pinch of sea salt, avocado oil, water, and a few flavor extras if you like. The batter comes together in the mug and cooks quickly in the microwave—perfect for late-night cravings or when you want a tiny dessert without committing to a whole pan.

Below I walk through the exact ingredient notes, step-by-step directions, useful swaps, equipment suggestions, and troubleshooting tips so your mug brownie turns out reliably fudgy and deeply chocolatey every time.

The Ingredient Lineup

1/4 cup gluten-free all-purpose flour — provides structure; use a blend with xanthan gum if possible for better texture.

1/4 cup coconut sugar — adds sweetness and a hint of caramel flavor; packs well into the measuring cup for accuracy.

3 Tbsp cocoa powder — unsweetened cocoa gives the chocolate base; sift if lumpy for a smoother batter.

1 pinch sea salt — balances sweetness and enhances chocolate flavor.

3 Tbsp avocado oil or melted coconut oil — fat for moistness and fudginess; avocado oil keeps a neutral flavor.

3 Tbsp water — hydrates the dry ingredients; you can substitute milk for a richer result.

1/4 tsp ground cinnamon — optional but recommended for a warm, rounded flavor; add to the dry mix.

1/8 tsp pure vanilla extract — optional; stir in with the wet ingredients for aromatic depth.

1 Tbsp chocolate chips — optional mix-in or topping; melts into gooey pockets when microwaved.

Mastering Gluten-Free Mug Brownie: How-To

Follow these steps exactly with the listed ingredient amounts. This preserves the balance between dry and wet ingredients so the mug brownie sets correctly yet stays moist.

Choose a microwave-safe mug that holds at least 12 ounces. Lightly grease the inside if your mug has a nonstick coating you don’t trust.

Measure 1/4 cup gluten-free all-purpose flour into the mug. Add 1/4 cup coconut sugar, 3 tablespoons cocoa powder, and a pinch of sea salt.

If using the optional spice, add 1/4 teaspoon ground cinnamon now. Stir the dry ingredients thoroughly until evenly combined and no large cocoa clumps remain.

Add 3 tablespoons avocado oil (or melted coconut oil) and 3 tablespoons water to the mug. If using the optional vanilla, add 1/8 teaspoon now. Stir vigorously until you get a smooth, slightly thick batter with all flour incorporated.

Spoon in 1 tablespoon chocolate chips, folding them into the batter or sprinkling them on top—either works.

Place the mug in the microwave and cook on high for 40 to 50 seconds. Microwave power varies: start with 40 seconds, then check. The center should be barely set and still moist—overcooking will yield a dry result.

Carefully remove the mug (it will be hot). Let it sit for about 30 seconds to finish setting. Top with a scoop of ice cream if desired and serve immediately.

Why I Love This Recipe

This recipe is quick, forgiving, and genuinely satisfying. It transforms pantry staples into a warm dessert in under a minute, so it’s perfect on busy nights or when you crave something sweet without baking an entire tray.

I also love that it’s gluten-free without relying on obscure flours. The texture is fudgy rather than cake-like, and it pairs beautifully with a cold scoop of vanilla ice cream or a drizzle of nut butter.

What to Use Instead

Oil swap: Use melted coconut oil if you don’t have avocado oil—flavor will be slightly coconutty.

Liquid swap: Replace water with any milk (dairy, almond, oat) for a creamier brownie.

Sweetener swap: If you can’t use coconut sugar, granulated cane sugar works, but the flavor will be less caramel-like.

Flour notes: Any gluten-free all-purpose blend with xanthan gum is best; blends without binder may yield a crumblier result.

Setup & Equipment

Microwave-safe mug (12 oz minimum) — room to stir without spilling and allows even cooking.

Measuring spoons and cups — accuracy matters here because the recipe is small-batch.

Spoon or small whisk — something to mix the batter smoothly in the mug.

Optional: small sifter — useful for cocoa powder if it’s lumpy.

Troubleshooting Tips

Dry or chalky texture

Microwaved too long — reduce cooking time by 5–10 seconds or check at 40 seconds.

Flour measurement too heavy — spoon flour into the cup and level off; don’t pack it.

Too wet or undercooked center

Microwave power too low — increase time in 5-second increments until center is barely set.

Mug size too small — use a larger mug so batter spreads more evenly and cooks through.

Gummy or dense

Overmixing can tighten texture — stir just until combined.

Using a flour blend without xanthan gum — try a blend labeled for 1:1 baking next time.

Warm & Cool Weather Spins

Warm-weather serving: top with a cold scoop of ice cream and a few fresh berries for contrast.

Cool-weather serving: stir in an extra 1 tablespoon chocolate chips before microwaving and top with a sprinkle of flaky sea salt to enhance warmth and richness.

Summer variation: fold in a tablespoon of chopped frozen raspberries for a quick fruit-chocolate contrast (stir briefly so they don’t bleed too much).

Notes on Ingredients

Measure carefully—this is a single-serve recipe, so small differences matter more than in a larger-batch cake. Coconut sugar contributes a deeper, less sweet flavor than white sugar; if you substitute, expect a flavor shift. The optional vanilla and cinnamon are small but effective flavor boosters, especially if your cocoa is natural rather than Dutch-processed.

Make-Ahead & Storage

This mug brownie is best eaten immediately for peak texture and temperature. If you must store leftovers, cover the mug and refrigerate for up to 24 hours; gently reheat in the microwave for 10–15 seconds. Note that reheating will change the texture—fresh is best.

Helpful Q&A

Can I bake this in the oven? — You could, but you’d need to transfer to a small ramekin and bake at 350°F until set, which defeats the convenience of the recipe.

Is this vegan? — Yes, with the listed ingredients it’s vegan—avoid dairy ice cream if you use it as a topping.

Can I double the recipe? — Doubling in one mug is not recommended. Make two separate mugs so each cooks evenly.

Why do some mug brownies turn out rubbery? — Usually from overcooking or using too much flour. Shorten microwave time and measure flour properly.

That’s a Wrap

This gluten-free mug brownie is a tiny, reliable dessert when you want chocolate now. Keep the ingredients measured, the mixing minimal, and the microwave time cautious. Add ice cream for indulgence, or enjoy it plain for a quick chocolate hit.

If you try it, tell me how you like it—vanilla, cinnamon, extra chips, or with a scoop of cold ice cream. Small tweaks make big differences, and I’m always curious which twist becomes your favorite.

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