Boil 2 medium potatoes until tender
Drain and mash the potatoes until smooth
Let the mashed potatoes cool slightly
Warm 1 cup milk
Dissolve 2 1/4 teaspoons active dry yeast in the warm milk
Add 2 tablespoons sugar and let sit until foamy
Mix the mashed potatoes, yeast mixture, 2 tablespoons melted butter, 1 teaspoon salt, and 1 beaten egg
Add 3 to 4 cups all-purpose flour gradually
Stir until a soft dough forms
Knead the dough on a floured surface until smooth and elastic
Place the dough in a greased bowl
Cover and let rise until doubled in size
Punch down the dough
Shape into a loaf and place in a greased loaf pan
Cover and let rise again until puffy
Bake at 375°F for 30 to 40 minutes
Remove from the pan and cool on a wire rack