I like the 1 minute flax bun recipe that mehhh2015 taught me. I slice it and make a sandwich with it: 1 thin slice ham, 2 thin slices provolone cheese, 2 long, sliced sandwich pickles. No need for mayonnaise because the flax and cheese provide the fat.
This sandwich and a variety of salads are my go to foods for work, because I only have 15 minutes to eat.
Recipe...
I put 1 T butter in a small glass measuring cup. I melt the butter in the microwave, typically 15 seconds then 10 more seconds to avoid splatter. Add 1 egg, then 2 T milled flax seed - (I grind 1 T flax seed in a coffee grinder for make 2 T milled flax). Then add 1/4 tsp baking powder, and a pinch salt. Stir thoroughly with a fork, pour into a microwave safe container. I use a round, 5 inch wide porcelain dish with 1 inch sides. Any shape will work. Microwave on high for 1 1/2 minutes. It's fun watching it poof!
I remove it from the dish, let it rest for a minute or two, then slice it in half. Sometimes, if I haven't already had a flax bun, I'll toast it and spread cream cheese on it. Yum!