Place water, oil, eggs, vanilla, and dry milk powder in the large bowl of an electric stand mixer and stir vigorously until milk is dissolved.
Sprinkle yeast over liquid mixture then add the 1 cup sugar, salt, and flour.
Put dough hook on mixer and mix for 10-15 minutes at low speed. The dough will be very sticky.
Cover bowl with plastic wrap and let rise until doubled in size, about 1 1/2 hours.
Turn dough onto floured surface and roll out into a rectangle shape.
Brush with melted butter.
Sprinkle with sugar and cinnamon.
Roll up rectangle lengthwise and cut into one-inch slices.
Grease a cookie sheet or line with parchment paper.
Place rolls on cookie sheet, cover with plastic wrap, and allow to rise until doubled in size, 1 to 1 1/2 hours.
Bake at 350 degrees for 12 to 14 minutes.
After baking, let cool slightly before frosting. Frost with Buttercream Frosting.
Makes about 18 rolls.