Slow Cooker Cheesy Garlic Herb Mashed Potatoes (Creamy Holiday Side) - My Home Made Recipe

Ingredients

• 4 lb (1.8 kg) Yukon gold potatoes, peeled and cut into 1 1/2-inch chunks
• 3 cups (720 ml) heavy cream
• 1 cup (240 ml) whole milk
• 4 large garlic cloves, smashed
• 8 fresh sage leaves, plus more for serving
• 3 fresh thyme sprigs, plus more for serving
• 1 Parmesan rind, optional
• 1 1/2 teaspoons kosher salt, plus more to taste
• 1/2 teaspoon black pepper, plus more to taste
• 6 tablespoons (85 g) salted butter, softened, plus more for serving
• 1 cup (115 g) freshly shredded Gruyere cheese
• Warm milk or cream, as needed for reheating