Preheat the oven to 400 degrees.
Slice the kielbasa into 1-inch pieces and place in a large bowl.
Cut all the vegetables roughly the same size. Add them to the large bowl with the sliced kielbasa.
Add the olive oil and the cajun seasoning. Stir to coat all the vegetables and kielbasa thoroughly.
Place the kielbasa and vegetables on a baking sheet lined with foil or parchment paper. Bake for 20 minutes.
Stir the vegetables and cook for 10-15 minutes or until fork-tender.
Serve hot, enjoy!