1 tablespoon olive oil
3 tablespoons unsalted butter
1 sweet onion, finely diced
2 garlic cloves, minced
½ teaspoon salt
½ teaspoon freshly ground black pepper
1 large head of cauliflower, chopped into florets
3 cups low-sodium vegetable broth
1 cup water
1/2 cup half and half or whole milk
⅓ cup buffalo wing sauce (or more to taste!), plus more for drizzling
⅔ cup freshly grated sharp white cheddar cheese