In a spacious mixing bowl, combine the spinach leaves, sliced strawberries, red onion, walnuts, and goat cheese. Gently fold the ingredients together to ensure an even distribution.
In a separate small bowl, whisk together the olive oil, white wine vinegar, maple syrup, whole grain mustard, and poppy seeds until well blended. Season the mixture with salt and pepper according to your preference.
Just before serving, pour the creamy poppy seed drizzle over the salad and carefully toss to coat all the ingredients in the dressing.
For optimal flavor, serve the salad immediately, or let it rest in the refrigerator for about 15 minutes to allow the flavors to meld beautifully.