Cook the orzo in salted water according to the package directions.
Drain well and transfer the cooked orzo to a large mixing bowl.
Add the diced tomato, red onion, crumbled feta, and chopped fresh basil to the bowl with the orzo.
Add the olive oil, basil pesto, garlic powder, salt, and black pepper.
Gently toss everything together until the orzo and vegetables are evenly coated with the pesto and seasonings.
Serve immediately, or cover and refrigerate for at least 30 minutes if you prefer your orzo pasta salad chilled.
Give everything another quick toss before serving and enjoy!