14 ounces kielbasa smoked sausage, sliced into 1/2-inch thick coins

1 pound baby yellow or red potatoes, halved or quartered, with pieces no bigger than 1 inch

6 ounces fresh green beans, ends trimmed and cut in half if long

6 ounces cremini mushrooms, cleaned and halved or quartered if large

1 small sweet onion, peeled and cut into 1-inch pieces

2 cloves garlic, minced

3 teaspoons dried Italian seasoning

1/4 teaspoon onion powder

1/8 teaspoon crushed red pepper flakes

2 tablespoons chopped fresh parsley

Coarse salt and freshly ground black pepper to taste

5 tablespoons olive oil