Cobb Salad and Bacon Buttermilk Dressing

2 hearts romaine lettuce, chopped

1 red bell pepper, seeded and thinly sliced

1 English seedless cucumber, quartered and sliced

1 small red onion, diced 

1 tomato, cored and cut into wedges 

2 avocados, peeled and diced 

2 cups small cubes sharp white Cheddar

6 hard-boiled eggs, chopped 

Bacon Buttermilk Dressing, recipe follows

Bacon Buttermilk Dressing:

1/2 cup buttermilk

1/3 cup sour cream 

1 tablespoon lemon juice 

2 teaspoons Dijon mustard 

1/2 teaspoon chili powder 

1/2 teaspoon salt 

1/2 teaspoon ground black pepper 

4 slices bacon, cooked until crisp and roughly chopped or torn