Preheat oven to 425 degrees. Place the vegetables on a baking sheet (line with foil for easy clean up.)
Drizzle 1-2 tablespoons of olive oil over the vegetables.
Sprinkle with garlic, salt, and pepper. Toss to coat.
Bake for 10 - 15 minutes, or until tender.
Sometimes I will also preheat the broiler and cook them that way. Same amount of time.
Note: I used several different spices and herbs when roasting vegetables. Not always do I use garlic. Mrs. Dash line of spices and herbs are great for this also. Just about whatever you have in your spice cabinet will work.