Preheat oven to 375 degrees.
In a small bowl, add butter, olive oil, garlic salt, pepper, and parmesan cheese. Mix until combined, then set aside.
Remove the leaves and the most of the core of the cauliflower, being careful not to cut too much off. The cauliflower head should remain intact.
Once the cauliflower is stuffed, spoon the sauce onto the cauliflower, making sure to spread it evenly all over the head of cauliflower.
Remove from oven, remove foil, and baste the cauliflower with the juices that dripped off during cooking.
Place the cauliflower back in the oven for another 20 minutes.
Remove from oven and set the oven on broil. Baste it one more time, then return it to the oven for 2-3 minutes. Keep an eye on it and don’t let it burn!
Sprinkle the cauliflower with freshly chopped mint, and add more cheese if desired (trust me, you’ll desire it).
Slice and serve!