1 Chicken breast
1/2 an onion thinly sliced
1 clove garlic minced (or pressed with garlic press)
Optional: prosciutto, fancy bread, chipotle mayo, creamy spicy cheese
Step 1: caramelize the onions and garlic with some olive oil in the pan you plan on cooking chicken in (i added garlic when the onions looked cooked but not yet brown) (medium heat and moving them around once in a while seemed to work for me)
2 butterfly the chicken breast (cut lengthwise so it is half as thick as it was before, tricky but cooks faster/ better)
3 sprinkle both sides with salt and pepper, and about a teaspoon of paprika, and maybe half a teaspoon of chipotle powder on each side of each piece.
4 when then onions are done, remove from pan, add a bit of olive oil. Make sure oil is hot then put in chicken pieces.
5 i'm sure you know how to cook chicken, but mine were done when they were nicely brown on both sides, using medium heat. i let them sit in the pan on the first side until i saw the edges cooked all the way through, and repeated for about the same time on the second side. I cut the pieces in half to fit on my bread
Now that the chicken is done, you can use the caramelized onions, chicken, prosciutto or pepper jack to make the sandwich (i put the prosciutto next to the bread, so it didn't get soggy.)
If you want it even spicier you can mix some chipotle powder with mayo for a dressing. (canned chipotle peppers also work for that.. but careful, they are ridiculously hot)