The two-dimensional (2D) chromium trihalides CrCl₃, CrBr₃, and CrI₃ are most famous for their exotic magnetic properties when their crystals get downscaled to nanometer dimensions. One way to tune the properties of such materials and to further increase their potential utility, e.g., in spintronics, is the formation of solid solutions. Here, we present a detailed theoretical and experimental study on the synthesis and nanoplatelet growth of CrBr_xCl_3-x and CrBr_xI_3-x solid solutions. Phase pure powder was obtained by tempering the respective parent compounds at 600 and 550 °C, using additional iodine in the case of CrBr_xI_3-x. The dominant stacking order changes at x = 1.8 for CrBr_xCl_3-x while remaining similar to CrI₃ for the whole CrBr_xI_3-x series. A consecutive chemical vapor transport from 575 → 525 °C for 2 h (CrBr_xCl_3-x) or 600 → 550 °C for 3 h with 0.1 mmol additional iodine (CrBr_xI_3-x) resulted in the deposition of high-quality nanoplatelets on a substrate with only several nanometers in height. The composition can be controlled by the choice of the starting material, since only small shifts in the anion ratio occur during the transport. The deposited CrBr_xCl_3-x nanoplatelets can then be easily delaminated by ultrasonication in ethanol to reduce the height even further to few-layer dimensions. These nanoplatelets could potentially be used to investigate the property changes (e.g., in terms of magnetic response) for the downscaling of these solid solutions. We further demonstrate the quality of the deposited material by transmission electron microscopy, selected area electron diffraction, and X-ray photoelectron spectroscopy. Raman spectroscopy of the solid solution series reveals a complex evolution of vibrational modes. Photoluminescence measurements on solid solution samples show emission peaks in the near-infrared energy range with the specific energy and intensity being composition and temperature dependent.