efcore 2.2 turn off proxy creation for a specific query when Using LazyLoadedProxies

I don't want any N+1 errors so want to ensure that I am not getting a Proxy.

No! you cannot disable proxy creation in EF Core query. But for JSON serialization you can turn it off as follows:

public void ConfigureServices(IServiceCollection services)
{
    ...

    services.AddMvc()
        .AddJsonOptions(
            options => options.SerializerSettings.ReferenceLoopHandling = Newtonsoft.Json.ReferenceLoopHandling.Ignore
        );

    ...
}