In a ¼ cup of warm water dissolve ½ teaspoon sugar and active dry yeast. Let it stand for 5-10 minutes to activate.
In another container mix milk and vinegar, set aside to sour for about 5 minutes.
In a deep bowl add rice flour, sugar, potato starch, tapioca starch, salt and psyllium husks, mix well.
In a bowl place the eggs and blend with a fork, add canola oil and melted butter and stir.
Add the egg mixture to soured milk. Pour over flour mixture, stir and add activated yeast.
Mix well all ingredients and for last add baking powder. The consistency is similar to cake batter.
Grease a loaf pan with butter, pour the batter and cover with plastic wrap also greased with oil. Leave a small opening for air to circulate.
Let the dough rise until doubled in size.
Preheat the oven to 375F, bake bread for 20 minutes then reduce the temperature to 350F and finish baking for another 20 to 30 minutes.
Before removing bread from oven make sure it is completely baked piercing the center with a toothpick, if the toothpick comes out clean the bread is ready to come out of the oven.
Let cool down for 20 minutes and remove from pan.
To store slice loaf, transfer to a ziploc and store in the refrigerator for up to 7 days.
Notes
For better texture toasted or grill slices after chilled.