Salads with mustard

8 ounces elbow macaroni , cooked until firm-tender 3/4 cup mayonnaise (not salad dressing) 1/4 cup plain yogurt 2 tablespoons cider vinegar 1 tablespoon Dijon[...]

1 lb waxy potato , peeled, cooked and cubed 1 chopped red onion 1/2 cucumber , washed, not peeled, cut into small cubes (remove the seeds if there are many) 1[...]

2 cups chopped cooked chicken breasts 2 ounces cherry tomatoes , halved 1/2 cup cucumber , thinly sliced 1/2 cup diced avocado 1/2 shredded carrot 1[...]