White wine is added just after you cook the mushrooms and is cooked on high heat, this process is called deglazing. Deglazing of a pan helps to prevent burning, as the wine lowers the temperature immediately, which also avoids the food to turn bitter. It also enhances the taste of the dish by releasing all the caramelized bits stuck in the pan. Wine when added in the sauce also enhances the flavor and balances the sauce which tastes delicious with Grilled Chicken.