1. Cook pasta according to package directions and drain.
2. While pasta cooks, heat oil in a large nonstick skillet over medium-high heat. Add onion and cook until translucent (3-5 minutes).
3. Add cabbage to pan and stir-fry for until cabbage is soft and browning (8-10 minutes).
4. Toss cooked pasta, salt, and pepper with cabbage mixture in pan and saute to combine flavors (2-3 minutes).