Baked Ziti

2 tablespoons olive oil
1 package frozen pepper stir-fry mix, thawed
28 ounces chunky spaghetti sauce
16 ounces short pasta, such as ziti or mostaccioli
2 cups shredded mozzarella cheese, divided
1/2 cup grated Parmesan cheese
1/3 cup sundried tomatoes, optional


In large saucepan, heat oil over medium-high heat. Add stir-fry mix; cook, stirring, until onion is softened. Add spaghetti sauce, bring to a boil. Remove from heat.Preheat oven to 350°F.Cook pasta according to package directions; drain. Return to pot, but do not heat. Add sauce, 1½ cups mozzarella cheese, parmesan and sundried tomatoes; mix well. Spoon into a baking dish. Sprinkle remaining mozzarella over top. Bake 20 minutes or until heated through and cheese is melted.