Mix well with a spoon or with your hands.
Here it seemed to me that I would add a little more flour (I also had more liquid cheese), but I was called by Sofia for 10 minutes from the kitchen and when I came back the oatmeal did its job well - it swelled a little and made coca Harder. So if the dough is wetter you can leave it for 10-15 minutes and it will be firmer.