Roasted garlic cauliflower cheddar dip

of a large head of cauliflower, broken into florets

large cloves garlic

extra virgin olive oil, divided

salt & pepper

grated sharp white cheddar cheese, plus a little bit more for topping

2% plain Greek yogurt (any fat % will work, but 0% won't be as creamy)

jalapeno, seeds removed and finely chopped (optional for a kick of heat)

chopped green onions for garnish