Skillet French Onion Chicken with Mushrooms

Name: Skillet French Onion Chicken with Mushrooms
Cook time: 30 min
Total time: 30 min
Cuisine: American
Ingredients: 4 boneless, skinless chicken breasts ((about 1 1/2 pounds)); 1 ½ teaspoon kosher salt; ½ teaspoon freshly ground black pepper; ½ teaspoon smoked paprika; 1 ½ tbsp cassava flour; 3 tablespoons extra virgin olive oil; 1 small yellow onion (halved and thinly sliced); 8 ounces thinly sliced baby bella mushrooms; 2 garlic cloves, minced; 2 teaspoons dijon mustard; 2 teaspoons fresh thyme leaves; ½ cup dry white wine; ¼ cup low-sodium beef or chicken broth; ½ cup freshly grated gruyere cheese