2 tablespoons packed brown sugar
2 tablespoons rice vinegar
2 tablespoons tamari or soy sauce
2 teaspoons toasted sesame oil
3 cloves garlic, sliced
1/2 teaspoon minced peeled fresh ginger
1 tablespoon vegetable, canola, coconut, or olive oil
1 pound boneless, skinless chicken thighs, cut into 1-inch pieces
1 pound dry rice noodles, cooked and at room temperature
Toppings: Thinly sliced scallions, fresh cilantro, sesame seeds
Place the brown sugar, vinegar, tamari or soy sauce, sesame oil, garlic, and ginger in a resealable jar. Shake to combine; set aside.
Heat a large skillet over medium heat. Add the oil and heat until shimmering. Add the chicken in an even layer and cook until golden-brown and cooked through, 3 to 4 minutes per side.
Reduce the heat to low. Pour about half of the reserved vinegar mixture over the chicken. Cook and stir until mostly absorbed. Spoon the chicken over the rice noodles. Pour over the remaining sauce. Top with scallions, cilantro, and sesame seeds. Serve immediately.