Place the rice vermicelli in a bowl and cover with warm water. Allow the noodles to hydrate for 10 minutes until soft and pliable.
Once the noodles are soft, drain them and chop into 2 cm. sections.
In a large bowl, combine the drained and cut vermicelli with the bean sprouts, finely shredded napa cabbage, grated carrot, thinly sliced scallions, minced garlic and optional chilies. Mix in the vegetarian oyster sauce, your choice of sweetener and tamari. Mix the ingredients until well combined.
For assembly, lay out your spring roll pastry sheets on a clean, dry surface. Spoon about 2 tablespoons of the filling mixture onto the center of the wrapper, placing it in the middle near one edge. Fold the sides of the wrapper over the filling, then roll tightly from the edge with the filling, sealing the roll with water.
For frying, heat 3 cups of canola oil, vegetable oil, or sunflower oil in a pan over medium-high heat. Fry the spring rolls until golden brown and crispy, turning every minute or so as needed until golden all around.
If you want to limit your personal consumption of oil, make these in your air fryer. Follow the appliance instructions for crispy results, using cooking spray, and make sure to leave some space between each spring roll.
Once cooked, transfer the spring rolls to a wire rack to cool slightly and drip off excess oil.
Serve the fresh spring rolls hot with homemade peanut sauce, nuoc cham, nam prik pao or your favorite dipping sauce.