1. In a large bowl combine 1/2 cup sweet rice flour, 1/2 cup brown rice flour, 1/4 cup tapioca flour, 1/4 cup cornstarch, xanthan gum, baking powder and the yeast; set aside.
2. In a medium saucepan heat and stir the milk, mashed potato, the 1/3 Clover Organic Salted Butter, granulated sugar and salt just until warm (120° F to 130° F) and the butter is almost melted; add to the flour mixture along with the eggs. Beat with an electric mixer on low to medium speed for 30 seconds, scraping the sides of the bowl twice. Beat on high speed for 3 minutes.
3. Using a spatula, stir in an additional 1/2 cup sweet rice, 1/2 cup brown rice, 1/4 cup tapioca and 1/4 cup cornstarch until incorporated. Line a clean counter top with 2 sheets of cling wrap slightly overlapping each other. Lightly dust the cling wrap with sweet rice flour then turn the dough out on top of it. The dough will be sticky at this point, sprinkle 1/4 cup more sweet rice flour over the top of the dough then use the outside of the cling wrap to help you fold the dough over on top of itself repeatedly until the flour is completely worked into the dough. Repeat this process with the remaining 1/4 cup of sweet rice flour.This kneading process will take about 5 minutes.
4. Once all of the flour has been incorporated place the dough in a lightly greased bowl, turning once to grease the entire surface of the dough. Cover; let rise in a warm place until doubled in size. (45-60 minutes)
5. Line the counter again with 2 large sheets of cling wrap that slightly overlap at the center and sprinkle lightly with sweet rice flour. Punch down the dough. Turn the dough out onto the floured surface then cover and let rest for 10 more minutes.
6. Meanwhile, lightly grease an 8 x 12 x 2-inch pan ( or a 3 quart rectangular baking dish) and set aside. Make the filling by mixing the brown sugar and cinnamon together in a small bowl; set aside.
7. Place 2 more sheets of cling wrap on top of the dough, gently press down to flatten then roll the dough into an 18x12-inch rectangle. Spread the 1/4 cup softened Clover Organic Salted Butter over the dough. Sprinkle the filling over the butter-spread dough rectangle, leaving 1 inch unfilled along one of the long sides. Roll up the filled rectangle into a spiral, starting from the long side with the filling. Pinch dough to seal seams.
8. Cut the dough spiral into 12 equal pieces. Arrange the pieces, cut sides down, in the prepared baking pan. Cover with a clean kitchen towel and place on the middle rack of your unheated oven; with a bowl of very warm water on the lower rack. Let rise until nearly double in size (about 30 minutes).
9. Remove the pan of rolls from the oven; uncover and set aside. Preheat oven to 375° F. Bake for 25 to 30 minutes or until golden brown and done in center. Cool in the pan on a wire rack for 10 minutes before drizzling rolls with icing. Serve warm.

Vanilla Bean Scented Icing

1. In a small bowl whisk together the powdered sugar, vanilla bean paste and milk.If the mixture seems too thick add a bit more milk, too thin more sugar. (I tend to double the recipe for the icing so we can really drench our cinnamon rolls in it!)