Preheat the oven to 425 degrees F/218 degrees C. Line a rimmed baking sheet with parchment paper. If you want them to be extra crispy, don’t use parchment paper and instead brush the baking sheet with a light coating of olive oil.
Rinse the cauliflower under cold water to clean. Pat dry, being careful to remove any excess water that would prevent the cauliflower from getting crispy in the oven.
Prepare the cauliflower by removing the leaves and slightly trimming the stem without slicing it fully off. Cut the cauliflower lengthwise from the head through the core, making 1 to 1.5-inch slices that resemble flat "steaks." Depending on the size of your cauliflower, you may slice between 4 and 6 flat pieces. Try to make them roughly the same thickness so that they cook evenly. The pieces from the middle will be the sturdiest, since they contain the core. The edge pieces may fall apart a little, but they can still be roasted alongside the thicker steaks. Transfer the cauliflower steaks to the lined baking sheet. Arrange them in an even layer. If they are too close together or overlapping, use two baking sheets.
In a small bowl, whisk together the olive oil, garlic powder, salt, and pepper until smooth.
Brush each side of each steak with the olive oil mixture.
Bake for approximately 25 to 30 minutes until golden brown and tender when poked with a fork. Flip the cauliflower very gently and only once, halfway through cooking time, to prevent them from falling apart.
While the cauliflower is roasting, prepare the tahini sauce. Whisk the tahini, lemon juice, maple syrup, parsley, and salt in a measuring cup or bowl until smooth. It will stiffen up, so add up to ¼ cup ice cold water slowly, and whisk as you go to get a runnier sauce that can be easily drizzled.
When the cauliflower is finished, transfer to a serving plate and drizzle with sauce. Sprinkle with pepitas, and garnish with more parsley. Enjoy!
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