Heat the olive oil in your fry pan over a high heat. Cook the tenderloin strips on both sides until browned (2-4 minutes per side). Depending on the size of your frypan, you may want to cook the chicken in two batches to avoid overcrowding. Remove tendies to a plate and cover once browned.
1 pound Chicken tenderloins, 2 tbsp Olive Oil
Turn the heat down to medium-high, and add the peppers and onion to the pan with the salt and pepper. Cook covered with a lid for 5 - 7 minutes until softened and partially browned. The lid is used to retain the moisture of the vegetables and prevent burning. Remove the lid frequently to stir the veg.
1 Red bell pepper, 1 Yellow bell pepper, 1 Sweet onion (brown or white), 1 tsp Salt, 1 tsp Pepper
Add the red wine vinegar and stir, allowing most to evaporate.
3 tsp Red wine vinegar
Add the crushed tomatoes and stir.
14 ounce Can crushed tomatoes
Return the chicken to the pan with any juices and cook the sauce down until at desired thickness and the chicken is fully cooked through. If the sauce gets too thick or dry, just add a little water back in.
Add the butter and Italian herbs / seasoning and stir through. Voila!
2 tsp Italian herbs / seasoning, 1 pat Unsalted butter