Rinse the cauliflower and pat dry. Cut out the leafy part of the cauliflower stem. Leave enough that all of the florets still remain attached to the main stem.
In a bowl mix the oil, butter, salt, pepper, onion powder, garlic, thyme, oregano, basil and paprika.
In a Dutch oven turn the cauliflower head upside down. Spoon or brush ⅓ of the seasoning mixture into the bottom of the cauliflower to let the oil coat the inside. Flip over and spoon or brush the remaining spice mixture over the top of the cauliflower.
Cover and bake for 40-45 minutes or until the cauliflower is easily pierced with a knife or skewer.
Before serving brush or spoon the oil at the bottom of the Dutch oven to cover the roasted cauliflower.