Heat the vegetable oil in a large skillet or wok over medium-high heat.
Add the minced garlic and chopped Thai bird's eye chilies. Stir-fry for about 1-2 minutes until fragrant.
Add the ground pork to the skillet. Cook, breaking it up with a spatula, until it is no longer pink, about 5-7 minutes.
Stir in the soy sauce, fish sauce, oyster sauce, and sugar. Mix well to combine.
Add the chicken broth or water and bring the mixture to a simmer.
Stir in the fresh Thai basil leaves. Cook for another 1-2 minutes until the basil is wilted and fragrant.
In a separate small pan, fry the egg to your liking (sunny side up is traditional for this dish).
Enjoy your meal!