Peel and cut 2 medium yellow potatoes into small pieces. Make sure they're around the same size so they cook evenly.

Put the potato chunks in a pot of boiling water. Let them cook for about 15 to 18 minutes until they're soft when poked with a fork.

Once the potatoes are cooked, drain them in a strainer. Then, use a spatula to push them through the strainer, or you can mash them finely with a fork or masher.

In a mixing bowl, combine the mashed potatoes with 1 and 1/3 cup of potato starch. Mix them together well. If the dough feels too dry, add 1 tablespoon of water at a time until it forms a solid dough.

Step 5 Shape Noodles:

Take about 1 tablespoon of the dough and roll it into a small ball using your hands. Then, press a glass bottle halfway into the dough ball. Repeat this process until you've used up all the dough.

Bring a pot of water to a boil. Carefully drop the button noodles into the boiling water and let them cook for about 5 minutes. To check if they're done, take one out and take a little bite. It should be soft but still a bit firm. Once they're cooked, transfer them to a bowl of cold water to stop the cooking process.

Finely dice garlic and slice green onion. Transfer them on top of the button noodles.

In a bowl, mix together 1 teaspoon of dark soy sauce, 2 teaspoons of light soy sauce, 1 tablespoon of Chinese black vinegar, and ½ teaspoon of granulated sugar. Add 1 tablespoon of peanut butter (or sesame paste) for extra flavor.

Sprinkle in 1 tablespoon of Korean chili powder (gochugaru) for a spicy kick. You can also add ½ teaspoon of chicken bouillon for extra flavor, if desired.

In a small pan, heat 3 tablespoons of vegetable oil or peanut oil on high heat until it's hot.

Mix everything together until well combined. You can add 3 tablespoons of chopped cilantro for freshness if you like. Garnish with sesame seeds for a nice touch.

Pour the chili oil sauce over the cooked potato button noodles. Mix well to coat the noodles evenly. Enjoy your delicious homemade potato button noodles with flavorful chili oil sauce!