4 tbsp. butter
1 sm. onion, chopped
3 tbsp. flour
2 c. milk
1/2 tsp. salt
1/4 tsp. white pepper
1/4 c. shredded cheddar
1/4 c. grated Parmesan
8 slices trimmed toast
Slices cooked chicken or turkey breast
Crisp fried bacon, crumbled
Mushroom slices, sauteed (opt.)

Saute onion in butter until transparent, add flour and combine. Add milk, salt and pepper and whisk until smooth. Cook on medium heat until sauce thickens, stirring occasionally. Add cheeses and continue heating until they blend. Remove from heat. Put one slice of toast in each of four oven-proof individual serving dishes. Top each piece of toast with slices of chicken or turkey. Cut remaining toast slices diagonally and place on sides of sandwiches. Ladle cheese sauce over sandwiches. Place sandwiches under broiler until sauce begins to bubble. Garnish with crumbled bacon and sauteed mushroom slices and serve immediately.