Creamy Mashed Potatoes with Roasted Garlic and Parmesan - My Homemade Recipe

Ingredients

• 2 whole heads garlic
• 1 tablespoon olive oil, for roasting
• 3 tablespoons olive oil, for serving
• 1.4 kilograms Russet or Yukon Gold potatoes, peeled and quartered
• 360 milliliters heavy cream
• 100 grams Parmesan cheese, finely shredded
• 56 grams salted butter
• 0.25 teaspoon salt, plus more to taste
• 3 tablespoons fresh thyme leaves
• freshly ground black pepper, to taste