Dissolve yeast in lukewarm water.

Stir in sugar, liquid nonfat milk, melted butter, and salt.

Gradually stir in 3 1/4 cups flour.

Knead dough on a floured surface until smooth and elastic, about 8 minutes.

Gradually work in the remaining flour as needed.

Place dough in a buttered bowl and brush the top with melted butter.

Cover the bowl and let rise in a warm place until doubled in size.

Punch down the dough to release air.