The field of nanotechnology is gaining interest among the researchers towards the eco-friendly way of synthesis of nanoparticles. In this project, green synthesis technique was employed to induce the synthesis of copper nanoparticles using Plectranthus amboinicus, i.e. Mexican mint, identified as Coleus amboinicus leaf extract. We report an eco-friendly synthesis of copper nanoparticle using Plectranthus amboinicus leaf extract, which is a simple and an ostentatiously rapid method which produces stable nanoparticles. The copper sulphate solution was naturally employed as a precursor for synthesizing the copper nanoparticles. The extract of the plant Plectranthus amboinicus was found to showcase excellent reducing and stabilizing properties. By using Ultraviolet-Visible spectroscopy, Zeta Potential, and X-Ray Diffraction (XRD) studies, it was confirmed that copper nanoparticles have been synthesized. The UV-Spectrometer analysis shows the characteristic peak indicating the synthesis of copper nanoparticles. The pattern of XRD analysis showed particle size of 16 - 25 nm and it reveals high crystallinity of the copper nanoparticles. Zeta potential was done to find the charge of the nanoparticles and size distribution which showed to have significant stability. This method proves to be cost-effective, can be performed at ease, and it’s also free of pollutants.