In a large bowl, add 2 tablespoons oil, apple cider vinegar, paprika, salt, onion powder and garlic powder. Whisk to combine. Add cauliflower florets to bowl and toss to coat thoroughly, about 1 to 2 minutes.
Place well seasoned florets on oiled baking sheet and bake, turning once midway, until florets are tender and nicely browned on edges, about 25 minutes.
Remove from oven and transfer florets to a serving platter. Garnish with thinly sliced celery and scallions, minced parsley and a pinch of red pepper flakes (if using). Drizzle with Ranch Dressing (below), and serve.
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