Mashed Potatoes And Celery Root

Ingredients

• 2 1/2 pounds russet potatoes, peeled and cut into 1-inch cubes
• 1 large celery root, peeled and cut into 1-inch cubes
• 3 cloves garlic, peeled
• 1/2 cup almond milk, divided
• 1/4 cup extra-virgin olive oil, divided
• 2 tablespoons minced fresh chives
• 1/2 teaspoon salt, or to taste
• freshly ground black pepper to taste