This tool automates the creation C++ modules to your project. What used to be a tedious, error-prone task is now a fast process.

Open the tool with Tools > New C++ Module. Enter the module's name. Optionally select host type (runtime, editor, etc.) and loading phase. On Unreal Engine 4, the tool is found under File > New C++ Module.

The tool creates the files, updates the .uproject file and re-generates your solution file. All that's left for you to do is update your build target files ("*.Target.cs") to include the newly added module ("ExtraModuleNames.Add("*")"); if you added the module to a plugin, the last step can be skipped.