A mixer assembly and a method for forming a fuel-air mixture is combinable with a burner system of a heat engine, especially a gas turbine plant. A flow-through component (1) provides a flow deflecting region (8) which provides at least two air inlet openings (2, 3, 4) to which is each connected a flow passage section (5, 6, 7), which flow deflecting region deflects the airflow which enters the respective flow passage section (5, 6, 7) by a deflection angle β≠0°, and each has an outlet opening, and that a mixing passage section (11, 12, 13) is connected to each of the outlet openings of the flow passage sections (5, 6, 7), in each of which mixing passage section is provided at least one flow vortex generating structure (14), and which each provides an outlet opening; or that a fine mixing region (15) is connected to the outlet openings of the flow passage sections (5, 6, 7), which fine mixing region has a multiplicity of individual flow passages (23) which, in each case, have a passage cross section which is dimensioned smaller than the passage cross section of the flow passage sections (5, 6, 7) in the region of their outlet openings; or that a mixing passage section (11, 12, 13) is connected to the outlet openings of the each of flow passage sections (5, 6, 7), in each of which mixing passage section at least one flow vortex generating structure (14) is provided.