Why is asp.net webAPI always returning text/html?

I would like to create webservices returning json. However, I'm always getting 'text/html' as the responses content type.

First shot:

 public StringContent Get()
 {
     List<Cell> list = new List<Cell>();
     Cell c = new Cell("Cell1");
     Cell c2 = new Cell("Cell2");
     list.Add(c);
     list.Add(c2);

     return new StringContent(
       Newtonsoft.Json.JsonConvert.SerializeObject(list),
       Encoding.UTF8,
       "application/json");
 }

Responsecontent: System.Net.Http.StringContent

second shot:

    public List<Cell> Get()
    {
        Cell c = new Models.Cell("Cell1");
        List<Cell> list = new List<Cell>();
        list.Add(c);
        return list;
    }

Responsecontent: System.Collections.Generic.List`1[TestApp.Models.Cell]

This is how I access the endpoint:

$.ajax({
            url: "http://localhost:54787/Cell/Get",
            type: "GET",
            contentType:"application/json",
            accepts: {
                text: "application/json"
            },       
            success: function (response) {
                $("#result").html(JSON.parse(response));
            },
            error: function (xhr, status) {
                alert("error");
            }
        });