Sear: Season chicken with salt, pepper, and paprika. In a large skillet, heat 1.5 tbsp olive oil over high heat. Sear chicken 4 mins per side until golden. Remove and set aside.
Sauté Mushrooms: Add remaining oil. Sauté mushrooms on high heat without crowding until caramelized.
Aromatics: Lower heat to medium. Stir in shallots and garlic; cook for 2 minutes.
Deglaze: Pour in lemon juice and balsamic vinegar. Scrape the pan to release the fond.
Thicken: Add broth and cornstarch slurry. Stir until the sauce becomes glossy and thick.
Simmer: Return chicken to the pan. Simmer for 5 minutes. Garnish with fresh herbs.