How to make the best solar powered oven?

So for our 10th grade science class we need to make a solar powered convection oven. The maximum it can be is 1mx1mx1m. What we will do is at 11:15 bring them outside on the football field with a small thermometer inside. Our goal is to get the oven to get as hot as possible! Our grade literally depends on whose gets the hottest. So our question is how to make the solar powered oven get as hot as possible?

Thanks and safe materials only!

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