Mushroom Chicken

Bahan-bahan (4 porsi)

• 2 large boneless, skinless chicken breasts ((about 1 1/4 pounds))
• ¾ teaspoon kosher salt (divided)
• ¼ teaspoon ground black pepper
• ¼ cup all-purpose flour
• 2 tablespoons olive oil (divided)
• 2 tablespoons butter
• 12 ounces sliced mushrooms (I use 8 ounces cremini and 4 ounces shiitake)
• 1 medium shallot (finely chopped)
• 2 cloves garlic (minced)
• 1 ¼ cups low sodium chicken broth
• 1 teaspoon Dijon mustard
• 1 teaspoon sherry vinegar
• ½ cup heavy cream
• 2 teaspoons chopped fresh thyme (plus additional for serving)
• Mashed potatoes or rice (optional for serving)