All ingredients ready? Let's begin!
Whisk 2 tablespoons of the oil with the balsamic vinegar, mustard, honey, red pepper flakes if using, and garlic.
Heat the rest of the oil in skillet.
Add the chicken tenders and some salt and black pepper.
Cook for 3 minutes on each side or until golden.
Meanwhile, snap the woody ends off the asparagus and discard them.
Cut the tomatoes in half.
Remove the chicken from the skillet.
Add the asparagus and tomatoes to the skillet with some more salt and black pepper.
Cook for 5 minutes then push the vegetables to one side.
Put the chicken back in the pan and add the balsamic vinegar mixture.
Stir and cook for 5 minutes or until the sauce is thicker and the chicken is cooked through.