Fill 3-quart saucepan 2/3 full of water; heat to boiling. Add Pasta. Gently boil, uncovered, 12 minutes, stirring occasionally; drain. Rinse with cold water to cool; drain well.
Meanwhile, in 10-inch nonstick skillet, cook bacon and onion, stirring occasionally, until bacon is crisp. Transfer bacon and onion to large bowl with slotted spoon, reserving bacon drippings. Stir Seasoning mix from packet, vinegar, brown sugar, oil and mustard into drippings.
In large bowl, toss bacon and onion mixture, spinach, pear and dressing until mixed; stir in cooked pasta. Sprinkle cheese over top of salad. Serve warm.