Preparation Preheat oven to 450° F / 232° CLiberally grease a 4-cup popover pan with vegetable oil.Combine all purpose gluten-free flour, gluten-free sweet rice flour and salt in a small mixing bowl. Whisk to thoroughly combine.Combine half & half (light cream), eggs and gluten-free flour mixture (in that order) in a large blender pitcher. Blend at high speed. Use a spatula to scrape down the sides of the pitcher and pulse briefly. The popover batter should look like very thin pancake batter.Place popover pan in preheated oven for 3 minutes. Carefully remove pan and fill each popover cup 1/2 to 2/3 full. Place pan back in preheated oven and bake for about 25 minutes. Reduce oven temperature to 300° F / 149° C and bake an additional 5-7 minutes or until the popovers are deep golden brown. Serve warm.Cook's Note: I prepared a dairy free version of gluten-free popovers using canned coconut milk with poor results. Not only didn't the popovers pop as high, they did not have the characteristic hollow inside and they did not brown well.Reminder: Always make sure your work surfaces, utensils, pans and tools are free of gluten. Always read product labels. Manufacturers can change product formulations without notice. When in doubt, do not buy or use a product before contacting the manufacturer for verification that the product is free of gluten.