Start by placing your fresh baby spinach in a large serving bowl. Ensure the leaves are dry so the dressing sticks well. Add the thinly sliced red onions, spreading them evenly over the greens.
In a small jar or bowl, whisk together the olive oil, apple cider vinegar, honey, Dijon mustard, salt, and pepper. Continue whisking until the mixture is fully emulsified and smooth. Taste and adjust the sweetness or acidity according to your preference.
Sprinkle the dried cranberries and the toasted pecans over the spinach. These add the essential sweetness and crunch that make this Christmas Cranberry Spinach Salad so special.
Drizzle the prepared dressing over the salad just before you are ready to eat. Gently toss everything together using salad tongs. Finally, sprinkle the crumbled feta cheese on top to keep it from getting too messy, then serve immediately.
