This work unveils how to quickly manufacture highly efficient and stable perovskite solar cells (PSCs) using the Flash InfraRed Annealing (FIRA) method. With FIRA, the titanium oxide mesoscopic layer can be synthesized in only 10 min, and the synthesis of the perovskite film takes a few seconds. All is done in one place and continuously, allowing a better synchronization of the manufacturing process with high reproducibility. For this purpose, a new perovskite composition based on formamidinium (FA) lead iodide combined with a passivation post-treatment has been optimized, improving the film quality for PSCs. Here we show a step forward into the industrial application of the FIRA method in PSCs.