Preheat the oven to 350 degrees and line a baking sheet with parchment paper.
Chop the cauliflower head into florets, then place them in a food processor and pulse until the mixture resembles rice.
Remove from food processor and use a cheesecloth or paper towel to pat cauliflower rice dry.
In a large pan over medium heat, warm the olive oil. Add the cauliflower rice and cook, stirring regularly for five minutes, then remove from heat and transfer to a large bowl; add the egg and mix to combine.
Add the almond flour and garlic powder to the bowl and season with salt and pepper; mix well to combine.
Transfer the cauliflower mixture onto the baking sheet, forming six squares, about ½-inch thick.
Bake for 15 minutes, then gently flip and bake for an additional 12 to 15 minutes, or until slightly golden.