Spirulina can change a cookie’s appearance and bite, so include more than colour in your pilot. One study tested 1% and 2% Spirulina platensis biomass in cookie formulas. The Spirulina cookies were darker and harder than the control. That is a reason to check those attributes early, not a prediction for every recipe.
Choose the cookie format
A crisp biscuit, soft cookie, filled cookie and reduced-sugar recipe are different matrices. Set the target product before testing: texture, colour, flavour profile, bake spread and shelf life. A powder that looks attractive in raw dough may not produce the desired baked colour or bite.
Keep the trial controlled
Make one base formula and a no-spirulina control. For each test, document powder mass, mixing sequence, dough temperature, portion size and bake conditions. Do not adjust flour or liquid without recording it.
Look beyond the first bite
Record dough consistency, spread and shape, surface and interior colour, hardness or chewiness after cooling, aroma, flavour and lingering aftertaste. Also check texture after the intended packaging and storage interval. A blind panel can rate each attribute separately.
If a sample is too dark, too hard or too earthy, change one factor at a time in the next trial. Do not assume a strong result in raw dough predicts the finished cookie.
What the research does—and doesn’t—say
The cited paper compared specific formulas with Spirulina and Dunaliella biomass. It found colour and hardness changes for the Spirulina cookies, but it does not establish a universal Spirulina amount or guarantee acceptance in your product.
Confirm the raw material and lot documentation, then repeat a successful formula on production equipment. AimGrow lists a bulk spirulina powder product; verify current specifications before testing.
The cited cookie research tested particular biomass, levels and recipes. Results are matrix-specific.