remove seeds and ribs from jalepenos, slice them into rings, dice chicken and set these items aside
in a hot skillet cook onions in 2 Tbls of olive oil until translucent then add chicken and cook until the chicken is just warm through
turn off stove and add taco seasoning and 1/4C water, mix well and then add sour cream
I made this in 2 personal size baking dishes but I would use an 8X8 glass baking dish to make these portions best. If you use 1 dish it is a bit messy to serve so it's best to let it rest a few minutes so the cheese helps hold it together.You will also want to cut and trim your tortillas to get the most coverage possible not just a round one in the middle although this might work if you use a rond cake pan...you decide, I have the dishes in the pictures I use specifically so I just always do it the same.
spray your baking dish with non-stick spray and place 1 layer of flour tortilla, add 1/2 the chicken mixture, 1/3 the cheese and 1/2 the jalepenos, then place 2 tortillas in dish, the rest of the chicken mixture and 1/3 cheese, place one more tortilla on top and the rest of the cheese to cover place remaining jalepenos on top. (Think mexican lasagna)