Bring a large pot of salted water to a rolling boil. Add the pasta and cook according to package instructions until al dente, about 8-10 minutes, then drain and rinse under cold water.

Chop tomatoes and lettuce into bite-sized pieces, and place them in a separate bowl.

In a skillet, heat olive oil and cook ground beef with taco seasoning for 6-8 minutes until browned; skip this step if using black beans.

Combine cooled pasta, cooked beef (or black beans), chopped vegetables, and corn in a mixing bowl. Fold in shredded cheddar cheese.

Pour your chosen dressing over the mixture and toss gently to combine.

Serve immediately or chill for about 30 minutes to allow flavors to meld.