Preheat the oven to 425 degrees F.
Start a large pot of well salted water (2-3 quarts) to boil
Slice the tomatoes in half
Place the halved tomatoes in a large bowl, add the oil, garlic powder, Italian Seasoning, salt and pepper and toss.
Cover a half sheet pan with foil and spread the tomatoes on the pan.
Roast the tomatoes in the oven for 10-15 minutes, until soft.
When the water comes to a boil, add the pasta and cook to el dente'
When the pasta is done, drain it and then stir the pesto through.
Place the roasted tomatoes over the top of the pasta and stir through before serving,
Garnish with some fresh chopped parsley.