First make the white sauce. Saute the 1/2 cup diced onion in 2 tablespoons butter. When the onions are clear add the 1/3 cup flour add milk to mixture and dissolve to the consistency of pudding, set this aside to cool. Next, prepare the ground meat by adding the 3/4 cup onion and seasonings to taste. Fry the tortilla shells when the shells are done you are now ready to assemble the Things. Spread shells with onion sauce. Sprinkle the hamburger over the top, then the green chilies, shredded cheddar cheese, and Picante sauce to taste. Pop in a 350 degrees oven until the cheese is melted.