In a large skillet, brown your lean ground beef with the minced onion over medium heat until the beef is fully cooked through. Drain any excess fat thoroughly to keep it light. Season with salt and pepper to your liking, then set it aside to cool completely.
Cook your chosen pasta according to the package directions until it's perfectly al dente. Drain well, then toss the cooked pasta with 1 tablespoon of olive oil to prevent sticking. Let it cool down while you prepare the rest of the salad.
In a large mixing bowl, combine the ½ cup olive oil, fresh lime juice, and taco seasoning. Whisk everything together until the dressing is well blended and fragrant – this is where all the zesty flavor comes from!
Add the cooled pasta, cooled ground beef, thawed corn, rinsed black beans, cheddar cheese, halved cherry tomatoes, diced red and green bell peppers, diced jalapeño (if using), and sliced green onions into the bowl with the dressing.
Gently toss all the ingredients until everything is nicely combined and coated in the delicious dressing. Cover the bowl and refrigerate for at least 30 minutes. For the best flavor, let it chill for a few hours, allowing all those incredible tastes to meld together.
Before serving, give the salad another good stir. Garnish with fresh cilantro or parsley if desired, and taste to adjust seasonings – you might want a little more salt, pepper, or lime juice! Enjoy this hearty and vibrant pasta salad!