Chicken Breasts With Vinegar Sauce (Guyana -- Caribbean) - cooking recipe

Ingredients

4 boneless skinless chicken breasts
1/8 teaspoon salt, to taste
1/8 teaspoon black pepper, to taste
2 ounces unsalted butter
1 tablespoon vegetable oil
3/4 cup wine vinegar
1/2 cup onion, chopped
1 tablespoon cornstarch
1 tablespoon water

Preparation

Season chicken breasts with salt & pepper, to taste.
Heat a large skillet over medium heat then add oil & butter.
Add chicken & brown on one side, about 8 minutes, then turn over, reduce the heat & cook, covered, at least 10 minutes. Then remove breasts to a serving platter, & keep warm.
To the skillet add the chopped onion & cook until transluscent, about 5 minutes, then add the wine vinegar & turn heat to medium-low.
In a small container mix cornstarch with the tablespoon of water & mix thoroughly before adding it to the skillet, stirring to combine. Continue cooking & stirring until slightly thickened, then pour the onion mixture over the chicken breasts & serve.