Attention, college kids: You can make this in your dorm!
Preheat the oven to 450°. Line a large rimmed baking sheet with parchment paper. In a large bowl, whisk the almond flour, garlic powder, and 3/4 cup water. Add the cauliflower; season with salt and pepper. Toss until coated; spread out on the baking sheet. Bake, rotating the sheet once, until the cauliflower is crisp-tender, about 20 minutes. Return the cauliflower to the bowl.
Preheat the broiler. In a small saucepan, melt the butter; stir in the hot sauce. Pour over the cauliflower; toss until coated. Return the cauliflower to the baking sheet, spacing the florets apart. Broil until charred in spots, 15 to 20 minutes. Serve with the ranch dressing.