French Onion Scallop - cooking recipe

Ingredients

6 large onions, peeled, sliced & cooked in salted water
2 tablespoons butter
1/2 cup breadcrumbs, mixed with the butter
Sauce
4 tablespoons butter
4 tablespoons flour
1/2 teaspoon salt
1/4 teaspoon pepper
2 cups whole milk
6 slices swiss cheese
1 tablespoon Worcestershire sauce

Preparation

Heat oven to 325F degrees.
Melt butter in a medium saucepan.
Stir in flour, salt and pepper until a paste is made.
Slowly add milk and whisk until smooth and thick.
Add cheese and Worcestershire sauce.
Whisk until cheese is melted.
Remove from heat.
Place drained cooked onions in a casserole dish and pour cheese sauce over them.
Sprinkle w/ buttered crumbs.
Bake until bubbly (20 minutes or so).