There is no big secret to roasting veggies you just have to pick ones that cook at roughly the same time.
2 red, orange, yellow or green bell peppers sliced thick
1 zucchini cut in thick half slices
(Or generally cut veggies of your choice, cut into chunks)
1 tbls olive oil
1 tbls balsamic vinaigrette
salt and pepper
garlic and onion power (or other seasonings of your choice)
Preheat oven to 450 degrees.
Mix veggie chunks in a bowl.
Pour in oil and vinaigrette, and spices, and mix.
Pour onto sprayed cookie sheet.
Put in oven for 10 minutes, then take out to flip, then put in for another 10 minutes.
Remove and then you're done!