Place rinsed and drained spinach in a large bowl.

Sauté onion and red pepper in a little olive oil in a skillet while the pasta is cooking.

Drain the pasta well, then add both the pasta and vegetables on top of the spinach while they're hot.

Add bacon, feta cheese, sun-dried tomatoes, shredded chicken, and toss well.

Combine the olive oil, vinegar, salt and pepper, and mix well.

Pour over salad and toss to combine. Serve warm or cold.