Emily’s Chopped Salad

3 heads romaine lettuce, cut into bite-sized pieces
1 avocado, cut into small pieces
10-ounce carton cherry tomatoes, cut into halves
14-ounce jar hearts of palm, cut into small pieces
5 ounces blue cheese crumbles
2.5-ounce bag bacon bits
Balsamic vinegar
Olive oil
Kosher salt
Freshly ground black pepper