Preheat oven to 400°F.
Toss cauliflower, olive oil, salt and pepper and spread onto a baking sheet. Bake for 20 - 25 minutes or until tender and lightly browned.
Transfer cauliflower to a food processor and add yogurt, 8 ounces cheese, garlic and dijon. Season with salt and pepper. Process for 1-2 minutes or until mixture is creamy.
Add cauliflower mixture to a medium cast iron skillet or baking dish, top with remaining 1/4 cup cheese and bake for 15 minutes or until bubbling and the top is browned.
Remove from oven, sprinkle with scallions and top with jalapeno.
Serve with baguette and/or crudites.