Preheat oven to 375°F. Lay prosciutto on a parchment-lined baking sheet and bake for 8–10 minutes, or until crisp. Let cool, then crumble.
Make The Dressing
In a small jar or bowl, whisk together olive oil, honey, vinegar (or lemon juice), and a pinch of salt and pepper.
Assemble The Salad
In a large bowl or platter, layer the spring mix, apple slices, and strawberries. Top with crumbled prosciutto, cheese, granola, and red onion if using.
Dress and Serve
Drizzle the dressing over the salad just before serving.