Mix the oats, butter, and 2 cups water in a bowl and allow the water to soak up the oats.
In another bowl, stir the sugar into the warm water. Add the yeast and mix lightly. Allow to set for about 5 minutes to create a foam.
Mix the brown sugar, salt, and 4 cups of flour together. Add the soaked oats and the foamed yeast. Stir to mix.
Add in enough four to make a soft dough. You might need less than the entire 5½ cups.
Using a stand mixer or by hand, knead about 6 to 8 minutes until dough is smooth and elastic.
Grease a bowl. Put dough in and turn to coat all side of the dough. Cover and let rest in a warm place until doubled in size, about an hour.
Punch down, allow to rest for about 10 minutes.
Grease two 9-inch round baking pans
Divide dough into 18 balls about the same size. Put 9 balls into each of the 2 pans.
Cover and let rise until doubled, about 45 minutes.
Preheat oven to 350°F
Bake until golden brown, about 20-25 minutes.
Remove from pan to wire racks to cool.
Serve warm or room temperature.