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Discard · beginner

Seed Cracker Discard Thins

Key takeaway

Seed cracker discard thins are a flax-chia batter spread until you can see parchment, then dried low until they snap, not a second rosemary rolled cracker.

Spread-thin discard crackers loaded with sesame, flax, and pepitas. Not the rosemary rolled crackers; these are seed sheets you break by hand.

By Andrew Kittridge200g discard plus 40g sorghum and 15g tapioca. Flax and chia gel the sheet; this is not a 4-7% psyllium bread. Optional 10g certified gluten-free oats in the seed mix. Salt 4g in the batter.
discardcrackersseedssnackflaxgluten freedairy freeegg freevegan
Shatter-thin seeded gluten-free sourdough discard crackers on parchment

Prep

20m

Flax-chia rest

20 min

Bake

40m

Servings

8

Difficulty

beginner

The short answer

We already have a rolled rosemary discard cracker. These are different: a wetter discard batter spread into a paper-thin sheet, then paved with seeds so every bite snaps. I mix unfed gluten-free starter with a little sorghum, ground flax, and chia, which gel just enough to hold without a loaf-level psyllium dose. The sheet should look almost translucent before it bakes. If you can see the parchment through the batter, you are close. Indianapolis winters dry them extra crisp; summer humidity means an extra 5 minutes in a low oven. Claire packs them for the car instead of a gluten-full snack bag. Certified gluten-free oats can go into the seed mix if you want chew; uncertified oats cannot. No wheat, rye, or barley. These are discard thins, not bread, so skip the 90-110% loaf hydration math and chase snap instead.

For the method behind gluten-free structure, read the gluten-free sourdough guide and keep a lively culture with the starter guide.

Why it works

  • Ground flax and chia absorb discard water into a gel you can spread thinner than a rolled dough.
  • A low oven dries the sheet instead of baking a thick cookie with a wet center.
  • Seeds on top add fat and crunch so the thin starch film shatters instead of tasting like paper.
  • Scoring before the bake gives clean breaks without shattering the whole sheet.

Ingredients

  • 200gunfed gluten-free sourdough discard (100% hydration)
  • 40gsorghum flour
  • 15gtapioca starch
  • 20gground flaxseed
  • 10gchia seeds
  • 20gextra-virgin olive oil
  • 4gfine sea salt
  • 30gwarm water (95F / 35C)To loosen the spread
  • 30gsesame seeds
  • 25graw pepitas, chopped
  • 20gsunflower seeds
  • 10gcertified gluten-free rolled oatsOptional; certified GF oats only
  • 2gflaky saltFor finishing

Equipment

  • Rimmed baking sheet
  • Parchment
  • Offset spatula
  • Pizza wheel
  • Digital scale

Instructions

  1. 1

    Heat the oven to 300F (150C). Line a rimmed sheet with parchment. The low temperature is for drying, not browning a cookie.

    5 min

  2. 2

    Stir discard, sorghum, tapioca, ground flax, chia, oil, salt, and warm water until you have a thick batter that slowly ribbons off a spoon and smells quietly sour.

    3 min

  3. 3

    Rest 20 minutes. The flax and chia will thicken the batter into a spreadable gel. It should look glossy, not pour like crepe batter.

    20 min

  4. 4

    Scrape the batter onto the parchment. With a wet offset spatula, spread it as thin as you dare, into a rectangle that nearly fills the sheet. You should almost see the parchment through it.

    4 min

  5. 5

    Scatter sesame, pepitas, sunflower, and optional certified GF oats evenly. Press lightly with the spatula so they embed. Sprinkle flaky salt. The surface should look paved, not bare.

    2 min

  6. 6

    Score into squares or rectangles with a pizza wheel so they break clean later. You are not cutting through parchment, just marking the gel.

    2 min

  7. 7

    Bake 25 minutes. Rotate the pan. Bake 12-18 minutes more until the sheet is uniformly matte, the edges are bronze, and the center no longer looks wet or translucent-wet.

    40 min

  8. 8

    Cool on the sheet until you can lift the parchment. Break along the scores. If a piece bends, return those pieces 5 minutes at 275F (135C). They should snap loudly.

    20 min

Nutrition

Approximate values per serving. Always verify labels if you bake for celiac safety.

Nutrition facts per serving
NutrientAmount
Calories156 kcal
Protein5 g
Carbs14 g
Fat9 g
Fiber4 g
Sodium260 mg

Substitutions

Sorghum flour
Brown rice flour, 40g.
Pepitas
More sunflower seeds, same weight.
Olive oil
Avocado oil, 20g.

Storage

Cool completely, then store airtight up to 1 week. Recrisp 5 minutes at 275F if they soften. Do not refrigerate.

Notes

  • This is not the rolled rosemary cracker. If you want that texture, use that recipe. These are seed sheets.
  • Certified gluten-free oats only if you add them. Skip oats entirely if you do not keep a trusted bag.
  • Humid days: after baking, shut the oven off, crack the door, and leave the sheet inside 15 minutes more.
  • Everything-bagel seasoning can replace the seed mix, 80g, if the blend is gluten-free.

FAQ

How are these different from your discard crackers?

Those are a stiff dough rolled between parchment with rosemary. These are a flax-chia batter spread thin and covered in seeds. Different method, different snap.

Why is my sheet chewy in the middle?

It was too thick or underbaked. Spread until you can nearly see parchment, and keep baking until the center is matte. Recrisp pale pieces at 275F.

Do I need psyllium?

No. Flax and chia bind a thin sheet. Psyllium at bread percentages would make leathery crackers.

Can I use active starter?

Yes, same weight. Flavor is milder. Discard is the point of the recipe.

Are these vegan?

Yes, if your starter is only gluten-free flour and water, with no honey or milk in the jar.

Technique

Keep the method close

Psyllium, fermentation temperature, and a celiac-safe starter matter as much as the formula.

Sourdough guideStarter guide

About Andrew Kittridge

Home baker in Indianapolis documenting gluten-free sourdough: psyllium structure, whole-grain blends, and loaves that actually taste like bread.

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