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Brewer's spent grain (BSG) is a by-product generated during the brewing process. It is a rich source of dietary fibre and proteins, with great potential to increase nutritional value of food products. In this research different quantities of fresh (non-dried and non-milled) brewer's spent grain (15, 25 and 50%) were added to wheat flour on a replacement basis in order to evaluate its effect on fibre and protein content, instrumental parameters of colour, microbial stability and sensory characteristics of cookies. Protein and fibre content of cookies increased following the addition of BSG from 7.55% to 9.69% and 6.8 to 15.55%, respectively. Considering the colour characteristics, addition of BSG decreased L* and b* values, while a* values increased. Enterobacteriaceae, Escherichia coli, Clostridium spp., yeasts and moulds were not detected in cookie samples, while the Enterobacteriaceae were detected (40 cfu/g) in fresh BSG. The addition of 25% of BSG resulted in best sensory characteristics of cookies in terms of surface appearance, hardness, grittiness and flavour. The results have shown that fresh BSG has a potential to increase nutritional value of the cookies without negative influence on cookie sensory characteristics and microbiological stability.

The influence of the physicochemical properties of chestnut flour (CF) on the cookies quality was investigated. The experiments are planned on the base of 32 factorial plan with independent variables: chestnut flour quantity (20, 40 and 60% based on wheat flour) and moisture dough (20, 22 and 24%). The physical and sensory attributes of CF cookies were compared to control sample containing 100% wheat flour (WF). Substitution of WF with CF contributes to the increased cookies hardness for 10–40%. By increasing the dough moisture, the hardness of cookies containing 60% CF is reduced by 20–30%. Formulations with 20 and 40% CF and 24% dough moisture had the best sensory properties and improved nutritional quality. By increasing the share of CF, the red tone increases (a* parameter) and the color lightness of cookies reduces (parameter L*). In conclusion, the application of CF in cookie formulations can improve sensory and nutritional quality of cookies. Practical Applications Tea cookies are widely consumed as confectionary products, which are traditionally made from wheat flour. Several studies demonstrated that chestnut flour contains nutrients that have many health‐care functions. In this regard, it would be beneficial to develop a novel formulation for cookies with chestnut. This study explores the possibility of utilizing chestnut flour, at different substitution levels in order to produce cookies with acceptable sensory properties for consumers.