The Keto Baking Mechanic™ — Recipes

90-Second Keto Sourdough Discard Bread

Where We Create, Tweak and Enhance Keto and Low Carb Breads and Baked Goods

🍞 Real Sourdough Tang, 1.5g Net Carbs, Ready in 90 Seconds

If you have been searching for a way to enjoy the tangy, complex profile of real bread without the carb-heavy grains, this 90-Second Keto Bread is your solution. By integrating a keto-friendly sourdough discard, we bridge the gap between “microwave convenience” and “artisan quality,” creating a bread that toasts beautifully and satisfies the most demanding palate.

https://sinlesssourdough.com/shop/

The Difference

What Makes This Recipe Different

Unlike standard microwave keto breads that often rely solely on almond flour and can result in a “spongy” or “eggy” texture, this version uses the structural science of psyllium husk and the enzymatic power of sourdough. We utilize Biome Boss™ sourdough discard to introduce authentic fermentation notes, which elevates the flavour from neutral to sophisticated while maintaining a net carb count of only 1.5 grams for the entire loaf.

Philosophy

About Measurements & Precision

Traditional baking often teaches that cooking is art, but baking is science — meaning it must be precise. That’s why many bakers prefer weighing ingredients in grams instead of using cups.

Keto sourdough baking does not follow that traditional model.

Sinless Sourdough™ is a living fermentation system. Your starter changes daily depending on hydration, environment, temperature, feeding cycle, and ingredient brand. Because of this, no two bakes are ever identical.

Gram measurements listed in Sinless™ recipes are approximate reference points based on commonly available brands. However, ingredient density varies depending on brand, grind size, how tightly ingredients are packed, humidity, and storage conditions. This is especially true for:

• Oat fibre
• Vital wheat gluten
• Psyllium husks
• Active starter

Your starter’s weight will vary from day to day depending on how aerated or dense it is when measured.

The goal is not to hit an exact number on a scale. The goal is to build proper dough structure.

Watch your shaggy dough. If it doesn’t pull together, add hydration one tablespoon at a time. If it’s too loose, adjust dry ingredients gradually. Cups or grams — either works. Hydration awareness is what creates success. Sinless Sourdough™ is not about rigid precision. It’s about learning to read your dough.

The Science

Why It Works: Structural Science

The combination of psyllium husk powder and egg creates a flexible protein-fibre matrix. When heat is applied in the microwave, the water content in the avocado oil and sourdough discard turns to steam. The psyllium traps this steam, expanding the “crumb” and preventing the bread from collapsing. The addition of sourdough discard provides the biological lift and acidity that softens the proteins, resulting in a more tender bite.

Using Discard

Fermentation Context & Digestibility

By using a sourdough discard, you are benefiting from a long, slow fermentation process that occurred before this bread ever hit the microwave. This process helps break down anti-nutrients and may support a more comfortable digestive experience compared to standard unfermented keto baked goods.

What to Expect

Taste & Texture

Expect a rich, buttery flavour with a distinct sourdough tang. The texture is dense enough to hold up to heavy toppings like avocado or eggs, but light enough to feel like a traditional English muffin when toasted.

What You’ll Need

Ingredient Breakdown

• 1 Large Egg: Provides structure and protein.
• 1 tablespoon Avocado Oil: Adds healthy fats and moisture.
• 1 tablespoon Psyllium Husk Powder: The primary binding agent for a grain-free crumb.
• 3 tablespoons Biome Boss™ Sourdough Discard: The key to flavour and digestibility.
• ½ teaspoon Baking Powder: Ensures a quick, reliable rise.
• Pinch of Sea Salt: Enhances the natural sourdough notes.

What You’ll Need

Equipment

• Small mixing bowl
• Microwave-safe dish or silicone mold (round or square)
• Silicone cover, paper towel, or parchment paper

Let’s Bake

Step-by-Step Instructions

Whisk Wet Ingredients

In your mixing bowl, combine the egg, avocado oil, and salt.

Bind the Dough

Add the psyllium husk powder and mix continuously until the mixture becomes thick and pulls from the sides of the bowl.

Incorporate Sourdough

Fold in the 3 tbsp of Biome Boss™ sourdough discard and baking powder. Mix until a cohesive, heavy dough forms.

Prepare the Mold

Coat your microwave dish with oil. Transfer the dough into the mold, pressing it down firmly with a wet spoon to ensure a level top.

The “Pressure-Cooker” Effect

Cover the bowl with a cover or parchment paper to trap steam. Microwave on high for 90 seconds.

The Carry-Over Bake

Leave the bread in the microwave with the cover on for an additional 30 seconds to finish setting the center.

Slice & Toast

Remove, slice horizontally, and toast immediately for the best artisan texture.

Troubleshooting

Common Mistakes

Setting Expectations

Practice Batch Philosophy

Every microwave and every batch of sourdough discard is slightly different. Use your first batch as a baseline. If it feels too moist, add a teaspoon more psyllium next time; if too dry, add a splash of water or more oil.

By the Numbers

Nutrition (Whole Recipe)

Keeping It Fresh

Storage

Store in an airtight container in the refrigerator for up to 5 days. For longer storage, slice and freeze for up to 3 months. Always toast from frozen or chilled to revive the texture.