Place your yolks in a bowl and mash. Add some taco seasoning and your binding agent. Mix, taste.
Add more seasonings, binding agent, and taco sauce. Mix well.
I placed the mixture in a baggie. I put everything in one corner, twisted the top so there was a little pressure building up and snipped a little off the end. And then squeezed some in each egg. The duck eggs were a lot bigger than the chicken eggs.