Preheat oven to 425 degrees. Coat a 9x13 inch baking dish with vegetable oil spray. Sprinkle cheeses on bottom; top with chiles; set aside. In a mixing bowl, combine milk, eggs and Bisquick and beat until smooth. Carefully pour mixture over chiles. Top with salsa. Bake until puffed and golden, about

25 to 30 minutes. Cool for 10 minutes. Cut into bite-size pieces and serve warm.