Preheat oven to 325. Combine Cheeses in a bowl. Melt butter in 13" x 9" casserole dish. Lay whole chilies on melted butter, covering bottom of dish. Sprinkle 2/3 of the cheese on chilies. Mix the milk, eggs, Bisquick until smooth, add diced chilies and pour over cheese. Top with remainder of cheese. Bake for 45 minutes. Or use the toothpick method.