Cheesy Baked Mashed Potatoes

Name: Cheesy Baked Mashed Potatoes
Prep time: 20 min
Cook time: 1 h
Total time: 1 h 20 min
Cuisine: American
Ingredients: 4 lbs. yukon gold potatoes, peeled and cut into 2 inch pieces; 6-8 cloves garlic, peeled; Kosher salt and black pepper, to taste; 1 cup whole milk; 1/2 cup heavy cream; 6 Tbsp unsalted butter, plus more for greasing the baking dish; 6 oz fontina cheese, shredded; 3/4 cup finely grated pecorino romano cheese, plus more for topping; Panko breadcrumbs, for topping; Olive oil, for drizzling; Chopped fresh chives, for serving