Heat the vegetable oil in a large skillet over medium-high heat.
Add the minced garlic and chopped shallots, sautéing for about 1-2 minutes until fragrant.
Increase the heat to high and add the ground chicken, breaking it apart with a spatula. Cook until the chicken is browned, about 4-5 minutes.
Stir in the sliced red bell pepper, cooking for an additional 2-3 minutes until it softens slightly.
In a small bowl, mix together the soy sauce, fish sauce, oyster sauce, sugar, and minced Thai chilies. Pour this mixture over the cooked chicken and bell pepper.
Stir everything to combine and cook for another 2-3 minutes, allowing the flavors to meld.
Add the fresh Thai basil leaves and stir until wilted, about 1 minute. Taste and season with salt and pepper if needed.
Serve hot over steamed jasmine rice.
Notes
Adjust the number of Thai chilies based on your spice preference.