Prepare the Cauliflower: Preheat your oven to 400°F (200°C). Toss the cauliflower florets with olive oil, salt, and black pepper. Spread them evenly on a baking sheet and roast for about 20 minutes or until they are tender but still firm. Allow them to cool.

Prepare the Bacon: While the cauliflower is roasting, cook the bacon in a skillet over medium heat until crispy. Drain on paper towels and crumble the bacon into bite-sized pieces.

Make the Dressing: In a medium bowl, whisk together the mayonnaise, sour cream, sweet relish, mustard, and apple cider vinegar until smooth. Season with salt and pepper to taste. Adjust the dressing’s thickness by adding a little more vinegar or mayonnaise if needed.

Assemble the Salad: In a large bowl, combine the roasted cauliflower, sliced radishes, diced celery, shredded cheddar cheese, green onions, and crumbled bacon. Drizzle the dressing over the salad and carefully mix to ensure all ingredients are thoroughly coated.

Refrigerate and Enjoy: Let the salad chill in the refrigerator for a minimum of 30 minutes before serving, allowing the flavors to blend beautifully. Serve chilled and enjoy this deliciously creamy and savory cauliflower salad!