@acarnes, IDK if this would work for you but have found it pretty satisfying. It's very low in potassium and phosphorus and calories so you can increase amount if you need to and it contains no flour.

Vegetarian Omelet with cheese and veggies 189 mg K (9 %) 70.4 mg P (7 %)
Egg Beater ¼ C 127.8 mg K, 43.2 mg P
Daiya non-dairy mozzarella-flavored shreds 20 mg K, 20 mg P
1 T chopped onion 24.9 mg K 5.3 mg P 1
T chopped bell pepper 16.3 mg K, 1.9 mg P
Sm amt EVOO
Saute onion and bell pepper in sm amt EVOO in small skillet or in nonstick skillet without EVOO, remove and drain, turn heat to low
Pour 1 svg Egg Beater into pan and cook slowly, lifting up edges to allow uncooked egg to run underneath
Sprinkle pepper and onion over cooked egg, top with mozzarella shreds
Fold over and remove omelet to plate
For those who don’t tolerate bell pepper, celery can be substituted 27 mg K 2.3 mg P