Place cooked pasta in a large bowl.
Add the steak, red bell pepper, peas, carrots and bacon to the bowl with the pasta.
Make the dressing: Mix the mayonnaise, sour cream, lemon juice, garlic, parmesan, and salt and pepper to taste in a bowl. Pour just the amount of dressing over the pasta salad and toss to coat. You may have a bit of dressing left over. Keep chilled in the refrigerator until the next use. Season with salt and pepper.
Chill for up to 3 hours and toss again just before serving. You may need to add a bit more dressing, as the pasta tends to soak up the dressing.