Preheat the oven to 375°F. Cut the potatoes into small 1" x 0.5" pieces and toss with olive oil, salt, pepper, rosemary, and garlic powder. Spread on a baking sheet.

Roast the potatoes for 15 minutes, then add sliced sausage and chopped peppers and onion to the sheet. Toss to combine.

Continue roasting for an additional 25-30 minutes until everything is cooked and crispy, tossing once halfway through.