Preheat your oven to 400°F. Line a large baking sheet with parchment paper.
In a large bowl, combine the olive oil, Italian seasoning, garlic powder, salt, and pepper. Toss the sausage, potatoes, bell peppers, and onions in the seasoning mix until evenly coated.
Spread the seasoned sausage and vegetables in a single layer on the prepared baking sheet. Be sure not to overcrowd the pan to ensure everything roasts evenly.
Roast the mixture in the preheated oven for 25-30 minutes, stirring halfway through the cooking time, until the potatoes are tender and golden brown and the sausage is browned.
Notes
Cut ingredients evenly: Keeping the sausage and vegetables close in size helps everything cook at the same rate.
Don’t overcrowd the pan: Spread everything into a single layer so the vegetables roast instead of steam.
Use parchment for easy cleanup: It prevents sticking and makes cleanup quick.
Stir halfway through roasting: Turning the ingredients helps ensure even browning on all sides.
Check potatoes for doneness: They should be fork-tender and lightly golden before removing the pan from the oven.
Adjust seasoning after roasting: A final pinch of salt or pepper can help balance flavors once everything is cooked.