Pull Apart Potato Rolls

Name: Pull-Apart Potato Rolls
Ingredients: 1 medium Yukon Gold potato (about 6 ounces), scrubbed; 1 cup whole milk; ½ cup (1 stick) unsalted butter, melted, plus more for brushing; 1½ cups all-purpose flour; 2 ¼-ounce envelopes active dry yeast (about 4½ teaspoons); 3 (heaping) tablespoons sugar; 2 large eggs, beaten to blend; 1 large egg yolk, beaten to blend; 2⅔ cups (or more) bread flour; 1 tablespoon flaky sea salt, plus more; Vegetable oil (for surface); A potato ricer