mixed mashed potatoes

Ingredients

• 3 large russet potatoes, peeled, washed and cubed
• 1 large sweet potato, peeled, washed and cubed
• 2 large pinches coarse sea salt
• 4 tablespoons butter
• 1/2 cup light sour cream, or to taste
• 1/4 cup 35% heavy cream
• 1/2 teaspoon garlic salt, or to taste
• freshly ground black pepper, to taste (i always use mixed peppercorns)
• 2 large green onions (white and green parts), chopped
• 1 1/2 tablespoons fresh parsley, chopped