Combine spinach, apple, Cheddar cheese, cranberries, and pecans in a large salad bowl. Toss well.
Combine balsamic vinegar, maple syrup, and mustard in the bowl of an electric blender. Blend on medium speed until mixed well. While the blender is running, add olive oil in a steady stream. Blend until oil and vinegar are no longer separated. Add salt and pepper to taste and emulsify until creamy. Drizzle over salad and serve immediately.
You can tear the baby spinach leaves if preferred.
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