Place the spinach equally on two plates. Top with apple slices, goat cheese, walnuts, and shallots. Serve with apple cider vinaigrette.

Place the mustard, honey, garlic, shallot, vinegar, salt, and pepper in a blender. Blend on high speed to combine. Slowly pour in the olive oil while blending on low speed. Taste and adjust flavor with more vinegar or oil to your taste preference. Transfer to a salad dressing container. Serve immediately.

Refrigerate leftovers. When using leftovers, take vinaigrette out of the refrigerator an hour before as oil will solidify when cold. Shake well prior to serving.