She's a beaut.cs

var assembly = Assembly.GetCallingAssembly();
var actionMethods = assembly.GetTypes()
    // Find all non abstract classes of type Controller and whose names end with "Controller"
    .Where(x => x.IsClass && !x.IsAbstract && x.IsSubclassOf(typeof(TwilioController)) && x.Name.EndsWith("Controller"))
    // Find all public methods from those controller classes
    .SelectMany(x => x.GetMethods().Where(m => m.DeclaringType.Name == x.Name), (x, y) => new { Controller = x.Name.Substring(0, x.Name.Length - 10), Method = y.Name });

foreach (var action in actionMethods) {
    routes.MapRoute(action.Method, action.Method, new { controller = action.Controller, action = action.Method });
}