Cut all vegetables into similar sized pieces. I personally like to leave all the skins on all the vegetables, you can peel the carrots and potatoes if you like (refer to tips on how to cut some of the vegetables)
Once all vegetables are cut, place them on an oven tray lined with baking paper
Add the rosemary, oregano, garlic powder, salt and pepper and sprinkle evenly all over the vegetables
Drizzle over olive oil to lightly coat the vegetables