Place the cauliflower florets on a sheet pan. Drizzle with the oil and sprinkle with the chile-lime seasoning, cumin, salt and pepper. Toss to coat and bake until the cauliflower is roasted and browned, about 25 minutes.
For the smokey mayo: Meanwhile, make the sauce by adding the mayonnaise, honey, smoked paprika, salt, garlic, lime juice, chipotle pepper and adobo sauce to a bowl. Whisk together until smooth and incorporated.
Remove the cauliflower from the oven and transfer to a platter. Drizzle the sauce over the top and garnish with the scallions.