1Heat oven to 350°F. Spray 13x9-inch (3-quart) glass baking dish with cooking spray. If desired for garnish, reserve 2 tablespoons of the green chiles.
2In large bowl, beat milk and eggs with wire whisk until blended. Stir in chiles, Bisquick mix and cheese. Pour into baking dish.
3Bake 45 to 50 minutes or until puffed and golden brown. Pat reserved chiles dry with paper towel; sprinkle over casserole. Serve with salsa.