In a large bowl, toss the drained pasta with the roasted vegetables, marinara sauce, cheese, peas, 1/2 teaspoon salt and 1/2 teaspoon pepper. Using a wooden spoon, gently mix until all the pasta is coated with the sauce and the ingredients are combined.
6 Pour the pasta into a greased 9x13-inch pan. Top with the remaining 1/3 cup Parmesan and butter pieces.
7 Bake until top is golden and cheese melts, about 25 minutes.