Chicken, Cheddar & Apple Toss

Forgive me for another salad recipe. It's a slightly odd combination (or at least I thought so, but I might just be uncultured). This serves one, and the ingredients are not cut in stone - use however much or little you wish.

Chicken, Cheddar & Apple Toss

1 c. baby spinach, torn
2 oz. grilled chicken, diced
1/2 apple, diced
2 oz. cheddar cheese, cut into slivers
red onion, thinly sliced (to taste)
1 tbsp. dijon mustard
1 tsp. olive oil
2 tsp. vinegar
black pepper

Arrange first five ingredients on plate. Whisk together mustard, oil, vinegar, and black pepper. Drizzle over salad.