Preheat oven to 400. In skillet, over medium heat add:
3 T. oil
4 boneless, skinless chicken breasts
Lightly salt and pepper chicken and brown on both sides. Remove chicken and place in 9×9 inch baking dish.
Add to skillet:
2 T. flour
Mix until well combined.
Add:
1 c. milk
Stir until thickened. Remove from heat and add:
1 T. red wine vinegar
1/2 c. sour cream
salt and pepper to taste
1/2 t. dill
Stir to combine and pour over chicken.
Top with:
1/4 c. shredded parmesan cheese
Bake for 20 minutes, or until thickest part of chicken is no longer pink. Serve with boiled potatoes and steamed broccoli.