Preheat oven to 450 degrees. Add the cauliflower to a foil-lined baking sheet. Toss with the olive oil, salt and pepper (to taste), minced garlic (if using) and any additional spices you like. (Garlic powder is great if you don't have any fresh garlic.)
Bake for about 22 minutes, tossing the cauliflower halfway through. Cauliflower is done when easily pierced with a fork. You can leave it a little more or less tender, depending on your preferences.
Store in an airtight container in the refrigerator for up to 4 days. Reheat in a pan on the stovetop with some olive oil - microwaving tends to make it a bit soggy.