Cheesy-Good Whipped Potatoes | Holy Recipe

Ingredients

• 4 pounds Yukon Gold potatoes, peeled and cut into 1-inch-thick cubes
• cool water, to taste
• 2 sticks butter, room temperature
• 1 1/2 cups heavy cream
• 2 pounds Gruyère cheese, grated
• 1 pound fresh mozzarella cheese, drained and grated
• kosher salt, to taste
• freshly ground white or black pepper, to taste