BLTs are always a good idea in summer, especially when they come with blue cheese and steak sauce.
Preheat the oven to 400°.
Line a baking sheet with foil and set a wire rack inside. Arrange the bacon on the rack. Bake until very crisp, 16 to 18 minutes. Preheat the broiler.
In a medium bowl, whisk the blue cheese, sour cream, garlic, hot sauce, and Worcestershire. Stir in the chives; season with salt and pepper.
Season the sliced tomatoes.
On a large baking sheet, arrange the bread. Broil until lightly toasted, 2 to 3 minutes per side.
Build each sandwich with 1 piece of toast, the cheese sauce, 2 bacon slices, the lettuce, tomatoes, 2 more bacon slices, the onion, steak sauce, and another piece of toast. Cut the sandwiches from corner to corner.