Gather all ingredients before starting the recipe.
Mix marinade ingredients and cut tenderloin tips into cubes of roughly the same size.
Add marinade and tenderloin to a plastic resealable bag and message to make sure that beef is fully covered. Refrigerate for one to two hours. Remove from refrigerator at least one hour before cooking.
Slice onions and cherry peppers and aside until ready to use.
When ready to cook tenderloin, remove from marinade to a paper towel and pat dry.
Add olive oil to 10" skillet over medium high heat for 1-2 minutes.
Add tenderloin tips to skillet and cook for 1-2 minutes, or until the first side is nicely caramelized.
Move tenderloin to one side of the skillet and add sliced onions and peppers. Season with kosher salt and black pepper. Sauté for 4-5 minutes or until the onions are crisp tender.
Mix remaining marinade with 1 teaspoon of corn starch and 2 teaspoons of water and stir to combine. Add marinade mixture to the skillet, mix with beef and cook until the sauce thickens, 1-2 minutes.