Prepare the Dressing:
In a small bowl, whisk together the olive oil, balsamic vinegar, honey, Dijon mustard, salt, and pepper until well combined. Set aside.
Toast the Almonds:
Place the sliced almonds in a dry skillet over medium heat. Toast, stirring frequently, until the almonds are golden brown and fragrant, about 3-4 minutes. Remove from heat and set aside to cool.
Assemble the Salad:
In a large salad bowl, combine the baby spinach leaves, sliced strawberries, crumbled feta cheese, sliced red onion, and toasted almonds.
Dress the Salad:
Drizzle the prepared dressing over the salad ingredients, starting with half of the dressing and adding more as needed. Toss gently to coat the salad evenly with the dressing.
Serve:
Transfer the dressed spinach and strawberry salad to serving plates or a large platter. Serve immediately as a refreshing side dish or light main course.