My son is exactly the same as you - what we do is mix the egg and yolk together, and poach them in the microwae - I am also thinking that if you are having cheese for a snack that you could put some of that in there too? It probably wont be very easy with cream cheese/triangles, but maybe whip it in JUST before they are ready? My son is off the Phases now, and maintaining, will eat the white but not the yolk now!!!
"Life is like a coin. You can spend it any way you wish, but you only spend it once." - Lillian Dickson