In a saucepan, bring 2 cups water to a boil. Add oatmeal and butter; simmer 1 minute. Remove to a large bowl and let cool to 120°-130°. Heat the remaining water to 120°-130°; add yeast. To the oatmeal mixture, add brown and white sugars, salt, yeast mixture and half of the flour. Mix well. Add enough remaining flour to make a soft dough. Turn out onto a floured surface; knead 6-8 minutes or until smooth and elastic. Add additional flour if necessary. Place dough in a greased bowl, turning once to grease top. Cover and let rise until doubled, about 1 hour. Punch dough down; divide in half and shape each half into 12 balls. Place 1 inch apart on greased baking sheets. Cover and let rise until doubled, about 45-60 minutes. Bake at 350° for 20-30 minutes.