Ground Beef Patties With Cheese Sauce

[chief_cook2]

1 1/2 Lb. lean ground beef
1 Small onion -- chopped
1 Tsp. salt
1/4 Tsp. pepper
1 Tbsp. minced parsley
2 eggs
Sauce:
2 Tbsp. butter
2 Tbsp. flour
1 C. milk
1 Tsp. Dijon mustard
1/2 Tsp. salt
34 C. diced Swiss or Cheddar
cheese
1 fresh tomato -- chopped

Mix all and divide and shape into 4 patties. Place in a
baking dish. Bake at 400 degrees for 20 to 25 minutes, or until meat
is done to your liking. While meat bakes, prepare sauce.

Sauce:
Melt butter in a small saucepan; add flour. Over high
heat, stir in milk; heat and stir constantly until thick.
Stir in mustard, cheese and salt; stir until cheese is melted.
Add tomato. Pour sauce over cooked meat patties. Top with a
slice of cheese and a slice of tomato. Return to oven just
long enough to heat tomato and melt the cheese, 3 to 5 minutes.