In a bowl or large liquid measuring cup, whisk together the rice flour, cornstarch, salt, water, and oil.
Bring 1-2 inches of water up to a boil in wok or large sauté pan and place a steaming rack in the center of the wok. Lightly brush a non-stick square pan or ceramic plate (that comfortably fits inside the wok) with oil.
Give the batter a whisk then add 1/4 cup batter to the pan. Shake the pan to distribute the batter evenly then place on the rack, cover, and steam for 3-4 minutes, or until the rice noodle bubbles up.
Using oven mitts, carefully lift off the lid and remove the entire pan with the rice noodle from the wok. Brush with oil and let cool slightly, as the noodle sheet cools, it will firm up slightly.
Use an offset spatula or a scraper to release the edges of the rice noodle sheet. Use the scraper to roll it up into a log and set aside, covered. Continue to cook the rest of the batter, stirring the batter before you steam each noodle.
Cut the rolled up rice noodles into 2 inch lengths. Serve drizzled with soy sauce, hoisin sauce, scallions, toasted sesame seeds, sesame paste, and chili oil.