Tear spinach into fairly small pieces. Sprinkle bacon over spinach in salad bowl. Toss in mayonnaise dressing. At last minute cut up apples in small slices or chunks and toss with salad. Blend together.
Combine olive oil, vinegar, and ... large bowl, combine spinach, bacon, almonds, apple pieces, and onion; toss gently ... Pour dressing over salad and toss again. Serve immediately. Serves 4-6.