Preheat the oven to 375℉.
Next, slice and chop the potatoes, onion and bell peppers.
Now, mix together the spices. Then, add oil to the potatoes, onions and peppers then pour the spices over. Use a gloved hand and massage everything together.
Spray or spread a little oil across the sheet pan, you don't want it dry. Then, toss the seasoned ingredients into the sheet pan and make sure all the halved potatoes are facing cut side down.
Place in the oven for 45 minutes.
Remove, allow to cool a bit then serve.