Prosecco Chicken

Ingredients

• 4 skinless, boneless chicken breasts
• 2 teaspoons kosher salt, plus more as needed
• 2 tablespoons olive oil
• freshly ground black pepper to taste
• 1 pinch cayenne pepper, or to taste
• 2 generous cups thickly sliced mushrooms
• 1/4 cup diced shallots
• 3 cloves garlic, minced
• 4 teaspoons all-purpose flour
• 1 1/2 cups Prosecco or any sparkling wine
• 1/2 teaspoon tomato paste
• 2 teaspoons fresh thyme leaves
• 1 1/2 cups chicken broth
• 1/2 cup heavy cream
• 1 tablespoon aged balsamic vinegar (optional)