Derby Hot Browns

Ingredients

• 1/4 cup butter, cubed
• 1/4 cup all-purpose flour
• 1/4 teaspoon salt
• 1/8 teaspoon white pepper
• 1 cup 2% milk
• 1/2 cup chicken broth
• 1/2 cup sherry or additional chicken broth
• 1 cup shredded Parmesan cheese, divided
• 1/3 cup shredded sharp cheddar cheese
• 12 slices pumpernickel bread, toasted
• 1-1/2 pounds sliced cooked turkey
• 4 medium tomatoes, halved and sliced
• 12 cooked bacon strips, crumbled