Prepare the vegetables by chopping your zucchini, potatoes and onions.
Dump the vegetables into the baking tray and mix well.
Add the olive oil, garlic, tomatoes, parsley, salt and pepper.
Give everything a good stir, mix well and bake in the oven for half an hour.
Remove the dish from the oven and stir everything again. If you find it's a little dry, add a little water around the vegetables. Then, return to the oven for another 30 minutes.
Remove and cool for 5-10 minutes before serving.
Roasted Greek Potatoes