¼ cup buttermilk
¼ cup dry breadcrumbs
4 boneless, skinless chicken breasts
4 tablespoons unsalted butter
2 tablespoons canola oil
¼ cup chicken broth
2 tablespoons dry sherry, optional
1 cup heavy cream
1 (4 ounce) can pimentos, drained
1 can diced tomatoes, drained
¼ cup fresh basil leaves, chopped
1 cup grated Parmesan cheese
2 tablespoons garlic & herb cheese, like Boursin
½ teaspoon freshly ground black pepper