Chiles Rellenos Casserole
["1 lb. ground beef", "1/2 c. chopped onion", "1/2 tsp. salt", "1/4 tsp. pepper", "2 (4 oz.) cans whole green chiles, cut in half lengthwise and seeded, divided", "1 1/2 c. (6 oz.) shredded medium Cheddar cheese", "1/4 c. all-purpose flour", "1/4 c. milk", "4 eggs. beaten", "1 1/4 c. milk", "4 dashes of hot sauce", "1/2 tsp. salt", "dash of pepper"]
["Brown ground beef and onion in a skillet, stirring to crumble beef; drain well.", "Stir in 1/2 tsp salt and 1/4 tsp pepper, and set aside."]
["ground beef", "onion", "salt", "pepper", "green chiles", "Cheddar cheese", "all-purpose", "milk", "eggs", "milk", "hot sauce", "salt", "pepper"]