Cook bow tie pasta according to package instructions, drain and then run under cool water. Meanwhile defrost frozen corn under cool running water, remove any excess water.
Add pasta and corn to a large bowl. Add in tomatoes, onion and parsley.
In a separate bowl combine the sour cream, mayo, salt, pepper, garlic powder and red pepper. Whisk to combine. Pour over pasta and corn and toss to combine. Just before serving toss in feta cheese. Keep refrigerated until ready to enjoy.
Pasta salad can be prepared up to 3 days in advance. For best results, do not combine with dressing until just 24 hours prior to serving.