Cut apart all the florets and cut each one into thick slices.
Place these onto a baking sheet together with the garlic cloves, onion, and thyme. Season well with salt and pepper, and baste the florets with olive oil. Now sprinkle the cheese over everything and mix all the ingredients well.
Put the sheet into the oven for 25 minutes at 390° F.
While the cauliflower is baking, prepare the yogurt dip. Mix the chives and parsley into the yogurt together with salt and pepper.