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Preheat oven to 450º F.
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Line large baking sheet with parchment paper. Lightly coat with spray. Set aside.
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Place half of cauliflower in food processor; pulse until cauliflower is chopped into pieces about the size of rice. Repeat with the other half. Place in microwave-safe bowl.
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Microwave cauliflower on high for 6 to 8 minutes, or until cooked.
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Place cauliflower on cheesecloth, in small batches; squeeze dry. (If you do not have cheesecloth, use a heavy duty paper towel.) Do not skip this step, as cauliflower needs to be dry to make toast.
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Combine cauliflower, egg, cheese, salt, and pepper in a medium bowl; mix well.
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Place cauliflower mixture onto baking sheet in four even portions. Form into squares.
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Bake for 15 to 17 minutes, or until golden. Cool for 10 minutes before carefully removing from baking sheet.