In the bowl of a stand mixer fitted with the paddle attachment, combine 1½ cups (188 grams) flour, sugar, yeast, and salt.
In a medium saucepan, heat mashed potato, ½ cup (120 grams) milk, butter, and ¼ cup (60 grams) potato water or water over medium heat, stirring occasionally, until an instant-read thermometer registers 120°F (49°C) to 130°F (54°C). Add warm potato mixture to flour mixture, and beat at medium speed until combined. Beat in 1 egg (50 grams) until combined. With mixer on low speed, gradually add 1¾ cups (219 grams) flour, beating just until combined and stopping to scrape sides of bowl.
Switch to the dough hook attachment. Beat at low speed until a soft, somewhat sticky dough forms, 10 to 12 minutes; add up to remaining ¼ cup (31 grams) flour, 1 tablespoon (8 grams) at a time, if dough is too sticky. Turn out dough onto a lightly floured surface, and shape into a smooth round.
Lightly oil a large bowl. Place dough in bowl, turning to grease top. Cover and let rise in a warm, draft-free place (75°F/24°C) until doubled in size, 45 minutes to 1 hour.
Line a rimmed baking sheet with parchment.
Turn out dough onto a lightly floured surface. Divide into 6 portions (about 138 grams each). Shape each portion into a round. Place rounds, seam side down, at least 2 inches apart on prepared pan. Cover and let rise in a warm, draft-free place (75°F/24°C) until doubled in size, about 1 hour.
Preheat oven to 350°F (180°C).
In a small bowl, whisk together remaining 1 egg (50 grams) and remaining 1 tablespoon (15 grams) milk. Gently brush top of dough with egg wash. Using a sharp paring knife or lame, score an “X” shape into top.
Bake until golden brown and an instant-read thermometer inserted in center registers 190°F (88°C), 20 to 25 minutes. Let cool on pan for 15 minutes. Remove from pan, and let cool completely on a wire rack. Store in an airtight container for up to 5 days. Tightly wrap in plastic wrap, and freeze for up to 3 months.
Source: https://www.bakefromscratch.com/category/recipes/bread/feed/
