Abstract: The present invention relates to compositions comprising biomass of a thermophilic fungus for use as an ingredient in food products, beverages, pet foods or animal feed. Due to its nutritional composition the biomass of the thermophilic fungus can be used as a source of protein and/or amino acids, including essential amino acids; lipids, including oleic and linoleic acids; dietary fiber; choline and vitamins such as vitamin E; and minerals such as iron. The biomass of the thermophilic fungus is available as a compressed biomass cake or as a dried powder. As such the biomass of the thermophilic fungus is suitable as ingredient in meat replacers, and in hybrid meat products. In the form of dried powder the biomass of the thermophilic fungus can be easily mixed with other ingredients to produce bakery products such as bread or soups.