4 Boneless, skinless chicken breasts
4 Tbs butter, melted
1 Tbs mustard
1 Tbs vinegar (I usually use apple cider mixed with a little balsamic)
1/2 tsp salt
1/4 tsp cayenne, or to taste
1 cup breadcrumbs
In a small bowl, mix butter, mustard, vinegar, salt and cayenne.
Spoon mixture over the chicken.
Sprinkle with breadcrumbs.
Bake at 375 degrees for 40 minutes.