90-Second Keto Bread (Microwave Mug Bread)
90-second keto bread is a single-serving mug bread made by microwaving a batter of egg, almond flour (or coconut flour), and baking powder for about 90 seconds, giving you two bread-like rounds with roughly 3 g net carbs total — no oven, no yeast, and no waiting for dough to rise. It's the fastest way to get a sandwich base or toast substitute on keto.
Nut-allergy note: the standard version of this recipe is built on almond flour, a tree nut. If you or anyone you're serving has a tree-nut allergy, use the coconut-flour variation below instead — do not substitute almond flour for someone with a known nut allergy. As with any significant diet change, talk to your healthcare provider first, especially if you have kidney disease, are pregnant, or manage diabetes with insulin.
This page covers the classic almond-flour mug bread, the coconut-flour swap, the exact ratios and timing that make it work, and the finishing step most microwave-bread recipes skip. For the full picture of keto bread — loaves, bagels, and store-bought brands — start at the keto bread hub. For a deeper look at flour swaps in general, see keto flours explained, or the oven-baked version in our almond flour keto bread loaf.
What ingredients go in 90-second keto bread?
The base recipe is four ingredients: egg, almond flour, baking powder, and melted butter or oil, plus a pinch of salt. Egg provides structure and protein, almond flour replaces wheat flour as the low-carb base, baking powder supplies the lift a microwave can't develop through fermentation, and the fat keeps the crumb moist instead of rubbery.
| Ingredient | Almond flour version | Coconut flour version |
|---|---|---|
| Egg | 1 large | 1 large |
| Flour | 3 Tbsp blanched almond flour | 1 Tbsp coconut flour |
| Baking powder | 1/2 tsp | 1/4 tsp |
| Fat | 1 Tbsp butter or avocado oil, melted | 1 Tbsp butter or avocado oil, melted |
| Extra liquid | none | 1 Tbsp water or unsweetened almond milk |
| Salt | 1 pinch | 1 pinch |
Why the ratio changes with coconut flour: coconut flour is almost pure fiber and absorbs several times more liquid than almond flour by weight, so a coconut-flour mug bread needs far less flour and an extra splash of liquid to reach the same batter consistency — using the almond-flour ratio with coconut flour produces a dry, dense puck.1
How do you make 90-second keto bread?
Whisk melted fat and egg together in a mug, stir in the dry ingredients, microwave on high for about 90 seconds, then slice and toast for crust. The whole process, start to finish, takes under five minutes with no proofing or preheating.
Step-by-step instructions
- Melt the fat and whisk in the egg. Melt 1 tablespoon of butter or avocado oil directly in a microwave-safe mug or ramekin (about 20 seconds), then whisk in the egg until smooth.
- Add the dry ingredients. Whisk in the almond flour (or coconut flour), baking powder, and salt until the batter is lump-free.
- Microwave the mug. Microwave on high for 90 seconds. Ovens and microwaves vary, so start checking at 75 seconds — the center should look set, not wet, and spring back when lightly pressed.
- Turn out, slice, and finish. Run a knife around the edge, turn the bread out onto a cutting board, and slice it horizontally into two rounds. Toast the cut sides in a toaster, under a broiler, or in a dry skillet for one to two minutes per side.
A microwave heats the whole batter volume at once instead of browning from the outside in, the way an oven does — that's why the bread cooks through in 90 seconds but never crusts on its own. Toasting or pan-searing afterward is the standard fix: a dry, direct-heat step that browns the surface and firms up the crumb.
How many net carbs are in 90-second keto bread?
The almond-flour version has about 6 g total carbs and 3 g fiber per serving, for roughly 3 g net carbs; the coconut-flour version runs slightly lower, around 2 g net carbs, because so little flour is used. Almond flour itself is about 10–11 g net carbs per 100 g, while coconut flour is more fiber-dense at roughly 21–24 g net carbs per 100 g — but a serving uses only about 7 g of coconut flour versus 21 g of almond flour, so the finished bread still comes out lower-carb.1
| Version | Calories | Fat | Protein | Total carbs | Fiber | Net carbs |
|---|---|---|---|---|---|---|
| Almond flour | 300 kcal | 27 g | 11 g | 6 g | 3 g | ~3 g |
| Coconut flour | 210 kcal | 17 g | 9 g | 5 g | 3 g | ~2 g |
Check exactly how either version fits your daily target with the net-carb calculator, and see which other everyday foods are keto-friendly on the keto food list.
Can you make 90-second keto bread sweet or savory?
Yes — the base batter is neutral enough to go either direction. For a sweet version, whisk in a pinch of cinnamon and a keto-friendly sweetener before microwaving, then top with butter or sugar-free jam. For a savory, sandwich-ready loaf, stir in everything-bagel seasoning, shredded cheese, or chopped herbs, and use the toasted rounds as buns for eggs, deli meat, or a quick grilled-cheese.
For cleaner sandwich slices instead of a round mug shape, press the same batter into a small lined ramekin or skillet before microwaving.
Frequently Asked Questions
Can you make 90-second keto bread with coconut flour instead of almond flour?
How many net carbs are in 90-second keto bread?
Why is my mug bread rubbery or eggy tasting?
Is 90-second keto bread safe for someone with a nut allergy?
Can you toast 90-second keto bread?
Works cited
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