– 14-ounce package 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 very 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