Preheat your oven to 400 degrees F. Line a rimmed baking sheet with parchment paper. Spray the parchment paper with olive oil.*
Arrange the frozen cauliflower florets in a single layer on the prepared baking sheet. They won't all be the same size - that's OK. Don't worry about it.
Spray the florets with olive oil and sprinkle them with salt, pepper, garlic powder, and dried thyme.
Bake the florets until golden brown, 45-50 minutes. Serve immediately.
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Notes
*Make sure to use parchment paper that can withstand this oven temperature, or use nonstick foil instead.Here are a few ideas for changing up the basic recipe:
You can use melted butter instead of olive oil. It's very tasty!
You can use dried oregano instead of thyme.
If you like your food spicy, a pinch of cayenne is very good.
During the last 15 minutes of roasting, you can sprinkle the florets with grated parmesan.
You can keep the leftovers in the fridge, in an airtight container, for 3-4 days. Reheat them gently, in the microwave on 50% power. Or enjoy them cold in salads.