In a large bowl, whisk together 2 tablespoons chicken broth, 1 tablespoon lime juice, and 3 tablespoons chicken taco seasoning until combined.
Add the 1.5 lb chicken thighs to the bowl and turn to coat thoroughly in the marinade.
Heat a large skillet over medium heat and add 2 tablespoons oil. When hot, add the thighs and sear about 3 minutes per side until browned.
Remove the seared chicken from the pan and set aside.
Return the skillet to medium heat, add the sliced garlic and cook briefly until fragrant, about 30 seconds to 1 minute.
Stir in 1/2 cup sour cream and 1/2 cup chicken broth, bring to a low simmer to form a creamy sauce.
Meanwhile, shred or chop the reserved chicken into bite-sized pieces.
Add the shredded chicken back to the skillet, stir to coat with the sauce, and simmer 3 minutes until the sauce reduces and clings to the chicken; add a splash of broth or water if it reduces too quickly.
Taste and add salt if needed, then serve.