Mashed Potato and Bacon Pizza

Name: Mashed Potato and Bacon Pizza
Ingredients: 1 pound store-bought or homemade pizza dough; 8 slices regular or thick-cut bacon; 6 medium scallions; 1 to 2 sprigs fresh rosemary; 6 ounces low-moisture mozzarella cheese (about 1 1/2 cups shredded); 1 ounce Parmesan cheese (1/4 cup store-bought grated); 2 teaspoons olive oil, divided; 8 ounces russet potato (1 small); 8 ounces red potato (1 large); 1 large clove garlic; 2 teaspoons kosher salt; 2 tablespoons cream cheese (1 ounce); 1/8 teaspoon freshly ground black pepper; 2 tablespoons unsalted butter; 2 tablespoons heavy cream; 1/2 medium lemon; 1/4 cup heavy cream; 1/8 teaspoon kosher salt