Preheat oven to 425°F
Optionally, line the baking sheet with the aluminium foil, to make cleanup easier
Spray, brush, or drizzle the bottom with oil
If the vegetable needs it, do the prep work (trim green beans of the tops and tails, slice zucchini into coins, cut the woody ends off asparagus) on the cutting board
Fill the sheet with as many vegetables as you want
Spray, brush, or drizzle the vegetables with oil
Sprinkle with salt to taste, but probably cover them fairly well
Sprinkle with pepper to taste, maybe a little less than the salt
Optionally, sprinkle with garlic powder to taste, about the same as the pepper
Toss the veggies so they get evenly coated with the spices
Arrange them into a single layer
Put the sheet in the lower part of the oven
Bake for about 10 minutes, until they're as tender as you'd like
For green beans and asparagus, shake the sheet so they roll over and put them in for another 5 minutes
Remove from oven
Optionally, sprinkle with the grated Parmesan