Preheat oven to 220° C.
Cut potatoes, onions, and pepper into 2 cm cubes and place in your baking dish.
Drizzle the potato mixture with the olive oil. Sprinkle the chopped herbs, dried garlic, salt, and pepper over the potato mixture. Toss to coat the potatoes evenly with the oil, herbs, and seasoning.
Put the potatoes in the preheated oven and set a timer for 40 minutes.
While the potatoes are roasting, chop the green beans into 2 cm length pieces.
After the potatoes have roasted for 40 minutes, take them out of the oven. The potatoes should be just beginning to brown. Add the green bean pieces and give the mixture a stir to evenly distribute the beans.
Put the mixture back in the oven and set a timer for 15 minutes.
While the potatoes and green beans roast, slice the kielbasa (or other sausage) into ½ centimeter thick rounds.
When the potato and green bean mixture has roasted for 15 minutes, take it out of the oven. Add the sausage rounds and give the mixture a stir to evenly distribute the sausage pieces.
Bake another 20 minutes, stirring half-way though. The sausage rounds should be lightly browned and just beginning to crisp around the edges.